Follow TV Tropes


Characters / Osomatsu-san

Go To

This is the character page for Osomatsu-san. For Osomatsu-kun, go here.

    open/close all folders 

The Matsuno Family

     Tropes Applying to All the Sextuplets 
"We're the six same people! I am them, and they are me."
The Six Same Faces

  • Abhorrent Admirer: Totoko can use their lust for her to decent ends and cause them to help further her career in the idol industry, but at the end of the day she's still not interested in dating them.
  • Adaptation Dye-Job: They had black hair in the first series and both its anime adaptations, but they're depicted with brown hair in -San.
  • Always Identical Twins: They wouldn't be the Matsuno brothers if they weren't. Out of the main cast, Iyami's the only one who sometimes still has problems telling them apart, even though they all have telltale characteristics this time around.
  • Anatomy of the Soul: "Choromatsu Rising" reveals that each brother owns a physical manifestation of their self-consciousness, with some being more difficult to handle than others.
    • Osomatsu: A tiny but manageable red ball that fits in his pocket. It's dented and covered in dirt, which prompts Choromatsu to ask if it's just a clump of garbage.
    • Karamatsu: A glossy orb that's about the size of a crystal ball. It's translucent but has a blue tint.
    • Choromatsu: A planet-like mass that's floating above the city and blinding the people below it with its bright green light. It becomes bigger and more unstable whenever Choro's self-consciousness rises and he’s seen reading a book about how to control it in "The Star of Hope, Todomatsu". "Choromatsu Memorial Hall" reveals that it has gained sentience from how overdeveloped it has become.
    • Ichimatsu: A furry lump that looks almost like a cat. It's fairly large, reflecting its owner's secretly self-conscious nature, and Ichimatsu is seen burying it underground to keep the others from finding it.
    • Jyushimatsu: A bubble that's floating in space and contains a copy of himself.
    • Todomatsu: A pink disco ball. It's large and gaudy because of his tendency to lie about his social standing, so Totty only lets his family members see it.
  • Animal Motifs: Merchandise associates each brother with a specific animal.
    • Osomatsu: Red panda.
    • Karamatsu: Tiger.
    • Choromatsu: Sheep.
    • Ichimatsu: Cat.
    • Jyushimatsu: Dog.
    • Todomatsu: Rabbit.
  • Beady-Eyed Loser: They're unemployed, sexually frustrated, socially inept, still living with their parents, and ultimately very childish. Their beady eyes and faces contrast with those of the rest of the world's, as well.
    • It's highlighted in episode 15 when Jyushimatsu is sitting alongside some dozen other applicants waiting to be interviewed, with his face and look sticking out prominently as the most cartoonish-looking.
  • Berserk Button: They don't exactly take it well when they figure out they've been swindled. Iyami and Chibita have learnt this the hard way in Episode 10.
  • Butt-Monkey: While how much each of them qualifies as this varies at the beginning of the show, all of them eventually become standard examples of this trope throughout the first season as the show points out more and more just how pathetic they all are.
  • Cannot Talk to Women: With the exception of Todomatsu, who can generally handle himself quite well around women provided he isn't thrown off by anything, none of the brothers know how to interact with the opposite sex. Osomatsu believes groping and groveling for sex to be appropriate behavior, Karamatsu speaks in his usual cheesy one-liners and seems incapable of reading the mood of the room, Choromatsu shamelessly gushes over the cuteness of a girl if he so much as looks at a picture of one, Ichimatsu starts to act erratically out of fear and nervousness, and Jyushimatsu... acts like he usually does. A minor Running Gag has all of them (Todomatsu included) fall completely silent, give a Thousand-Yard Stare, and sheepishly cover their crotches when a girl walks past them.
  • Can't Stand Them, Can't Live Without Them: They get in each other's way. They piss each other off to no end. And when push comes to shove, some of them don't want to be living the life they're living. But even though it feels like they each have "five enemies", deep down, they really do love each other.
  • Classical Anti-Hero: The sextuplets are governed by laziness, naturally cowardly and prone to becoming jealous of the success of others.
  • Color-Coded Characters: In -San, as a way to tell them apart more easily:
    • Osomatsu: Red
    • Karamatsu: Blue
    • Choromatsu: Green
    • Ichimatsu: Purple
    • Jyushimatsu: Yellow
    • Todomatsu: Pink
  • Coordinated Clothes: Their iconic outfit from -Kun turns into a two button suit as adults, and they have a variation of it as pajamas. They also have a sweatshirt with the family symbol on it, but the sweatshirt is color-coded for each brother.
  • Childhood Friend Romance: Of the unlucky variant. All of them desire Totoko to date them and are even willing to share, but she repeatedly rejects them due to their status as NEETs.
  • Curtains Match the Window: Even when they got an Adaptation Dye-Job, they have brown hair to go with their brown eyes. F6!Karamatsu also had blue eyes and blue hair.
  • Dirty Coward: All of them prefer using dirty tricks to avoid punishment over taking responsible for their actions.
  • Dismotivation: As adults, none of them want to work, and they wish to live off their parents for as long as they can. This gets deconstructed in "Letter", where Choromatsu finally musters up the drive to pursue a proper career and Osomatsu's increasingly unpleasant behavior gradually motivates the other brothers to leave the house and start living on their own.
  • Divergent Character Evolution: Big time. In the original manga, they were so remarkably similar that even they couldn't tell each other apart at times, whereas -San gives them all distinct personalities and characteristics (as well as color-coded clothing). Iyami even lampshades this change and complains that their individuality defeats the point of them being sextuplets.
    • Season 2 shows that they even had their individualized traits as kids, according to Matsuzo's flashback. A later DVD version changed it so they all look more similar.
  • Even Bad Men Love Their Mamas: Downplayed; at the very least, they treat her a lot better than they treat their father.
  • Everyone Has Standards: In "First Time At The Races", even the brothers are fully aware that Totoko's behavior at the Horse Races is completely and totally incorrect.
  • Fat Bastard: One of the alternate timelines from Osomatsu-san Returns! depicts all of them sans Ichimatsu turning into this trope.
  • The Friends Who Never Hang: Discussed in the segment "Choromatsu and Ichimatsu", where Choromatsu and Ichimatsu are left alone together for the first time in their entire lives. While they have no problem interacting with each other when the other four are around to buffer them, when it's just the two of them things get incredibly awkward almost immediately. Especially notable, as they're identical brothers, not just friends. Of course, the segment itself also works to avert this by fleshing out how they interact with each other and elaborating on how each of them feels about the other.
  • Future Loser: The sextet of charismatic trouble-making kids grew up into a group of ambitionless NEETS.
  • Future Me Scares Me: Whenever the vintage Osomatsu-kun versions of the brothers appear, they're inevitably mortified by the sight of how pathetic their future selves are.
  • Green-Eyed Monster: All six of them tend to get violent (or at the very least angry and depressed) whenever they see a happy young couple.
  • Growing Up Sucks: Probably their most sympathetic reason for remaining NEETS into their 20s. All of them are shown to suffer from anxiety at the thought of making it out in the world on their own, as well as the possibility of failing.
  • Hidden Depths: Throughout the series, it's made apparent that while the brothers do enjoy mooching off their parents and living peacefully as hopeless NEETS, they all still feel varying degrees of guilt, regret, and depression for how they turned out. Much of their reluctance to move forward stems from anxiety and emotional dependency on each other.
    • The movie begins with them attending their high school reunion and feeling genuinely dejected after seeing just how far behind they are compared to their classmates.
    • Their internal struggles become even more apparent in Season 3. In "The Way Home", the sextuplets attend the wedding of one of their old classmates and spend the entire walk home contemplating their own lives. The segment is devoid of any gags, instead taking a more serious approach and focusing on the brothers' feelings of stagnation and being left behind. We learn that they're uneasy about marriage and living with a significant other, and they share a mutual desire to eventually have kids. Ultimately, the skit ends on a rather somber note, with the brothers unsure of where their lives are headed.
    Todomatsu: What's gonna happen to us?
  • Hive Mind: They're capable of moving and speaking in perfect unison, an ability that's especially prominent in "Iyami and Chibita's Rental Girlfriend".
  • Hotter and Sexier: They all go through this briefly in "Osomatsu-kun Returns" when they become F6, as they gain a more modern Bishounen look to gather up an audience.
  • Identical Twin ID Tag: Since there was no way to tell any of them apart in -Kun other than their voices, -San makes things a whole lot easier by giving each of them unique physical features.
    • Osomatsu: The only one who mostly retained his -Kun look.
    • Karamatsu: His eyebrows are larger and sharper than everyone else's. He also has a notch at the tip of his bangs, but this is usually only visible during close-ups. He also rolls up the sleeves of his sweatshirt.
    • Choromatsu: Has tiny pupils, no Idiot Hair and and angular mouth. He also wears a collared shirt under his sweatshirt and has his pant legs rolled up slightly.
    • Ichimatsu: His hair is uncombed and his eyelids are always half-closed, even when he's shocked or scared. He also wears sweatpants instead of jeans, overall making him look much scruffier than his brothers.
    • Jyushimatsu: Has one Idiot Hair instead of two and is perpetually smiling. His eyes often point in different directions. He's also the only brother to wear shorts instead of pants.
    • Todomatsu: Looks like Osomatsu but has shinier eyes and a distinct cat smile. He also wears flood pants that cause him to appear slightly trendier-looking than his brothers.
  • Idiot Hair: Two of them. Choromatsu lacks both of these hairs, but Jyushimatsu has a straighter example in just one.
  • Image Song: "Six Same Faces (~Tonight's the Best!~)". While it is about the sextuplets on a date, the song does show off each of their individual personalities very well, and each brother has an opportunity to talk about what their other brothers mean to them. It's a strange case though, as Iyami also chimes in to talk about the brothers sometimes.
  • Jerkass: While they each have their good points, all of the Matsu brothers are lazy, cowardly NEETS with unnecessarily petty and vindictive streaks.
  • Jerk with a Heart of Gold: They're all pretty horrible people in their own ways, but they're also far from irredeemable. Each of them has a few episodes that show that they're capable of genuine goodness when the situation calls for it.
  • Kavorka Man: The surprising success of the first series causes them to gain hundreds of adoring fangirls in the second season opening segment, while they've used their riches to turn into Fat Bastards (or in Ichimatsu's case an emaciated corpse) with even worse personalities than they normally do. Averted outside of this segment, where they Cannot Talk to Women, let alone get a date with any.
  • Lazy Bum: One of the primary reasons why none of them have jobs is because they're too lazy to bother to actively try and get one. Even the responsible-seeming Choromatsu admits to spending all of the time he claims to be job hunting masturbating.
  • Let's Get Dangerous!: When you get on the brothers' bad sides, you better prepare for absolute hell, as Todomatsu in episode 7 and Iyami and Chibita in episode 10 can attest to.
  • Living Emotional Crutch: "Letter" establishes that all the brothers are pretty much this to Osomatsu.
  • Loser Protagonist: Six unemployed, lazy and selfish virgins who are more focused on dragging each other down to the lowest rung of society than they are on trying to rise up through it. To top that all off, the only one with any feasible hope of living a fulfilling life happens to be a two-faced Social Climber.
  • Love Makes You Stupid: If a girl acts nice and has a pretty face, these brothers will do anything for her at the cost of their own livelihood. The boys are so blind in their love for Totoko that they refuse to see that she's ridiculously selfish, and they let Iyami and Chibita (as Iyayo and Chibimi) take every dime from their pocket after they've fallen for them.
  • Manchild: They're all described as this, and it shows. The boys act more like young teenagers than adults.
  • Massive Numbered Siblings: Six brothers. "Godmatsu" takes it even further by adding two more, though this doesn't stick.
  • Meet Your Early Installment Weirdness: A Running Gag has every season open with the brothers in their Osomatsu-kun days before seguing to their modern day selves. Along with being drawn in a black and white Retraux style reminiscent of the 1969 Studio Zero adaptation, none of them possess the distinct personality traits brought on by Divergent Character Evolution and they all speak with the same nonspecifically boyish tone of voice. It can be very strange hearing Karamatsu, Ichimatsu, and Jyushimatsu speak without any of their usual quirks.
  • Mr. Fanservice: Their F6 forms deliberately invoke this, with each subsequent appearance by them being increasingly risque. They are so attractive that they can even use it as a weapon, giving Totoko several often fatal nosebleeds throughout the show and subduing bandits just by flirting with them.
    • Subverted with their regular selves, who frequently appear naked but often for comedy and shock value.
  • NEET: They each fit the bill perfectly. Even their own mother calls them this to their faces. Whenever any of the brothers manage to get a job, they're somehow jobless again by the next episode.
  • Nice, Mean, and In-Between: Jyushimatsu and Karamatsu (Nice), Todomatsu and Ichimatsu (Mean), and Osomatsu and Choromatsu (In-Between).
  • No Social Skills: Osomatsu has No Sense of Personal Space and generally acts like a bratty 12 year old, Karamatsu speaks almost entirely in cheesy and incredibly forced dialogue that makes him painful to listen to, Choromatsu becomes a gibbering mess at the mere idea of talking to a girl, Ichimatsu can't go through a conversation with a stranger without muttering about how he's going to kill them or himself, and Jyushimatsu is so bizarre that it's close to impossible to have a rational conversation with him. Only Todomatsu has decent social skills, and even then later episodes reveal that that's only really in comparison to his hopeless brothers.
  • Non-Uniform Uniform: None of them wear their Coordinated Clothes the same way. Their F6 forms follow this trend as well, with each of them having a customized school uniform and idol outfit.
  • Older Alter Ego: Inverted: the F6, in their first appearances, are alternate teenage versions of the sextuplets. They can still turn into them if the comedy allows for it, but they're never stated to be teenagers again after the first episode.
  • Parody Sue: As F6, they become over-the-top parodies of the "perfect boyfriend" archetypes in Shoujo manga and Otome games.
  • Phrase Catcher: Several characters like to describe them as "shitty NEETS".
  • Porn Stash: The first episode of the second cour shows that all the brothers (sans Choromatsu) have a hidden stash.
  • Repetitive Name: All of them contain the word "Matsu" in the end of their first names and beginning of their last names.
  • Same Character, but Different: Justified—they have a fair bit of differences from their -kun counterparts and several of their character traits from that time (Choromatsu was more selfish, Ichimatsu was more strong-willed, Karamatsu was a Neat Freak, etc.) have been lost... which is exactly what you'd expect when children go through ten years of growth and development.
  • Sanity Ball: Generally held by either Choromatsu, the most responsible one, or Todomatsu, the most socially adept one, but each of them, even Jyushimatsu, can play the part of the voice of reason from time to time.
  • Sexier Alter Ego: Their F6 personas modify their usual personalities to make them "cooler" and more palatable.
  • Sibling Rivalry: As they got older, they became more distant and more antagonistic towards each other. Osomatsu even describes his relationship with them as having "five enemies" instead of "five comrades" once he grew up. However, as they all can attest to in "Six Same Faces", "I am my brothers, and my brothers are me".
  • Sibling Yin-Yang: The brothers all contrast themselves in one form or another, so here are the more obvious ones:
  • Sphere Eyes:
  • Spoiled Brat: Iyami at least believes this is the reason why they're such immature adults, and Osomatsu in particular states that he still wants to be spoiled when trying to convince Matsuyo to let him live with her in "Let's Become Independent".
  • Tall Poppy Syndrome: Of the "crabs in a bucket" variety. Rather than try to improve themselves, the Matsus are mostly content to drag anyone with a slightly more fulfilling life than them down to their level. This even, or perhaps especially applies to with each other, which is shown countless times throughout the series.
  • Twincest: Parodied mercilessly in the segments involving F6.
  • Twin Telepathy: Sextuplet variant. It's best showcased in the "Kerosene" skit, where all the brothers sans Jyushimatsu share a mental conversation with almost nothing spoken out loud.
  • The Unfavorite: They turn into this when Godmatsu appears, only in Episode 21.
  • Ungrateful Bastard:
    • They mostly just avoid interacting with their parents entirely, but on the occasions where they do they're shown to act whiny and petulant and only treat them well when they have something to gain from it. This despite their parents providing for them so that they don't have to work or live on their own. It's especially bad for Matsuzo, who, despite being their sole source of income, they go so far as to bully when he tries to get them to do something.
    • Even when Kamimatsu manages to convince their parents not to be too hard on the sextuplets for not having a job yet, saying that everybody has their own pace, the sextuplets still decide to try and kill him.
    • "Cherry Blossoms" works to subvert this somewhat, as all six of them, including Osomatsu, are inspired to finally start seriously looking for jobs due to the guilt they feel over not being able to support their parents after Matsuzo is hospitalized.
  • Unsympathetic Comedy Protagonist: While they're not completely unsympathetic, the matsu sextuplets are primarily characterized as a group of lazy, emotionally-stunted losers who bring most of their problems upon themselves. The more serious episodes tend to make an effort to show their better sides.
  • Used to Be a Sweet Kid: While they were always troublemakers, they were downright wholesome when they were younger. As adults, they've all become varying degrees of antisocial degenerates.
  • Vague Age: Their ages aren't specified beyond being in their twenties, and their parents have been married for 24 years. This makes it even more confusing, as -San is supposed to have taken place some 10 years after the end of the first -Kun series. Word of God however states they're no older than 25.
  • Vocal Dissonance: If they're still children during the "Returns" episodes, they certainly don't sound like it. The voices then sound closer to their voices ten-something years later.

     Osomatsu Matsuno
Voiced by: Takahiro Sakurai (Japanese), Billy Kametz (English)
Portrayed by: Shouta Takasaki (Normal), Yuuki Izawa (F6) (Stage Play), Koji Mukai (Movie)

The oldest and leader of the sextuplets. Despite being in his early twenties, he has the mentality of a sixth grader.

  • At Least I Admit It: While his cheerful contentment about remaining an unemployed loser is always portrayed negatively, it's also always presented as being the lesser of two evils when opposite Choromatsu's hypocritical denial of it.
  • Attention Whore: Discussed by Choromatsu, who claims that this is the source of Osomatsu's lack of tact and his immature personality. In "Iyami's Counterattack", he decides to fight Iyami to the death for the right to be the protagonist.
  • Beneath the Mask: While women are almost always disgusted by him, he's a Lovable Sex Maniac with No Sense of Personal Space who generally seems comfortable talking to them, particularly in comparison to most of his brothers. "Just Don't" reveals that this bravado immediately disappears on the rare occasions when a girl actually reciprocates his flirting, to the point where he goes into hiding and tries to get one of his brothers to go in his place when asked out on a date. His siblings are all understandably pissed to discover this.
    Todomatsu: Where'd your cockiness go!?
    Ichimatsu: Are you all talk!?
  • Big Brother Instinct:
    • Feels this despite only being a few minutes older than the rest. Chibita even actively encourages it in "The Melancholy of Osomatsu".
    • In the Drama CD segment "Totty's Request", Todomatsu demonstrates how he regularly exploits this in order to get what he wants out of Osomatsu, and even encourages Ichimatsu to do the same.
  • Character Tics: Wiping his nose with his index finger.
  • Character Title: For both -Kun and -San.
  • Clueless Detective: Plays the part in "The Calming Osomatsu", where he helps solve cases by lowering the tense atmosphere of the crime scene by messing around with the place and acting like a kid.
  • Cool Big Bro: He's a massive idiot most of the time, but he still has his moments where he tries to help his brothers out. Even when he's messing with them, he takes the reins in when necessary.
  • Decoy Protagonist: Somewhat. The show is named after him, but the brothers are very much an ensemble. To further his status as this, he generally gets the least amount of focus of the six, with episodes centering around him almost always revolving around his relationship with his brothers rather than anything about himself as an individual. This is lampshaded in "Iyami's Counterattack", where he is pelted with food and booed by the audience after proclaiming himself to be the main character of the series.
  • The Friend Nobody Likes: A subtler example than Karamatsu. While his younger brothers aren't vocal about it, all of them view him as a useless older brother whose laziness and unreliability drags them down as a group and prevents them from growing as people. When pressured to choose which of his brothers to send to a NEET correctional facility, Choromatsu chose him for this exact reason. What keeps Osomatsu's brothers from being very open about their negative view of him is the fact that, to a certain extent, all five of them are glad that with him around bringing them down collectively, they don't have to attempt to improve themselves individually.
  • The Gadfly: Out of the brothers, he's the most likely to mess with the others for fun.
  • The Gambling Addict: His two biggest hobbies are going to pachinko parlors and betting on horse races, and he's liable to spend any money he's given to do either, regardless of the actual purpose he was given the money for.
  • The Generic Guy: While he has his own personality, his defining traits (being lazy, childish and perverted) are simply more exaggerated versions of qualities that all of his other brothers display, causing him to be the least distinct of the six. This gets lampshaded when the group is forced to paint each other's faces after turning invisible, where, while all of the others are given stylistic representations of their most iconic personality traits, Osomatsu's brothers struggle to come up with anything to emphasize for him, eventually leading to them giving him a relatively accurate recreation of his actual face simply by trying to make it look as shitty and unremarkable as possible.
  • Glass Cannon: His preferred strategy for playing mahjong is to go exclusively on the offensive. While his utter lack of defense results in him losing almost instantly close to one hundred percent of the time, on the few occasions where it works he wins by a landslide.
  • Gratuitous English: Occasionally uses English words or phrases for the sake of emphasis, though other times he does it simply to sound cool.
  • Hair-Trigger Temper: Downplayed. It's surprisingly easy to piss him off, but he's pretty forgiving and generally won't resort to violence unless he's drunk or in a particularly bad mood.
  • The Heart: Despite Osomatsu's general demeanor, he generally has enough pull as the oldest to unite the brothers at least temporarily.
  • Hidden Depths:
    • "The Melancholy of Osomatsu" establishes that he gets lonely very easily and depends on his brothers far more than they depend on him, which becomes a recurring theme in later episodes. This ends up leading to a lot of tension after Choromatsu announces that he's moving out in "Letter".
    • This trait gets followed up again in Season 2's penultimate episode "Cherry Blossoms" where, after a hospital scare concerning their father, it's Osomatsu who uncharacteristically convinces his brothers it's time they buckle down and get jobs. He actually stays true to his worth, but still gets depressed over time that it seems like sextuplets are starting to drift apart due to their new responsibilities.
  • I Can't Believe a Guy Like You Would Notice Me: "Just Don't" shows that the thought of going on a date with the cute and willing Nyaa is enough to throw him into a Heroic BSoD, to the point where he refuses to show his face or speak in a register any louder than a barely audible whisper.
  • Idiot Hero: The most traditional example of the six. He's generally pretty stupid, naive and ignorant, but he buffers it with an endless amount of blind optimism.
  • Innocently Insensitive: He rarely acts maliciously towards his brothers and often tries to help them as the oldest. It just happens that he's extremely immature and thinks his behavior when he was 10 is okay as an adult.
  • Jack-of-All-Stats: Functions as this in the Tower Defense game Hesokuri Wars.
  • Jerkass: Even when none of the sextuplets are particularly outstanding people, Osomatsu tends to be portrayed as the sleaziest and most self-serving of the bunch.
  • Keet: While not nearly to the same degree as Jyushimatsu, Osomatsu tends to carry himself with a level of childish enthusiasm at all times. On the occasions where he doesn't, you know something's wrong.
  • Law of Chromatic Superiority: As the oldest and (ostensible) leader of the siblings, naturally he has a red Color Motif.
  • The Leader: By virtue of being the eldest, though he often ends up running into Authority in Name Only issues — while he does have some hold over the other siblings, being front and center when making any requests on behalf of his brothers, they don't really respect him that much because they're all aware of how idiotic he can be.
  • Limited Wardrobe: He's the only brother to lack an individualized outfit and is almost always just wearing his red Matsu sweatshirt. It actually acts as a pretty fitting metaphor for how he connects to his brothers.
  • The Load: His uselessness as an older brother really shines through, and he's described as "holding his brothers back" from moving on in life. After leaving a sour taste in everyone's mouths in "Letter" following Choromatsu's departure, the others start to leave him as well, with Osomatsu being the only one who remains stagnant and unchanged.
  • Lovable Sex Maniac: Compared to most of his brothers, he has no problem mustering the confidence to talk to women. This doesn't mean that he's actually good at talking to them, however, as he believes that trying to grope them and demanding sex are acceptable behavior. When the brothers have to audition for a mixer in "The Star of Hope, Todomatsu", Osomatsu's audition consists of him molesting Todomatsu (the stand-in for the girl) and having to be physically restrained by Choromatsu.
    Osomatsu: Huh? Isn't it okay to do that at mixers?
    Todomatsu: Like hell it is! What kind of image do you have of mixers!?
    Osomatsu: They'll let me touch them if I grovel.
    Choromatsu: This isn't a porno!
    Osomatsu: Eh!? You can't touch them!? Then I'm not going.
    Todomatsu: You're trash!
  • Manchild: While none of the brothers really act their age Osomatsu tends to stand out as the most emotionally immature, with character descriptions often comparing his mindset to that of a middle schooler.
  • Master of None: Functions as this in the Tower Defense game Hesokuri Wars.
  • Mr. Vice Guy: As Choromatsu notes, he's remarkably crass even when compared to the other brothers. He's also very fixated on money and won't hesitate to spend it all on gambling when he gets his grubby hands on some. In spite of this, he has an undeniable charm that keeps him from being completely unsympathetic.
  • No Social Skills:
    • The boy has absolutely no tact. When Choromatsu tries to meet his favorite singer, Osomatsu thanks her for "taking care of him" and then asks her to have sex with Choromatsu every once in while.
    • “Osomatsu and Todomatsu” shows that he can’t talk to girls without bringing up sex in one way or another. Todomatsu has none of it.
    • The movie starts with his brothers doing everything they can to pretend they aren't neets which is ruined the second Osomatsu comes back from the bathroom and even spills they're all virigins without a care of the world, not noticing how literally everyone is shocked at the information.
  • OOC Is Serious Business:
    • When Choromatsu leaves the house in "Letter", the rowdy and chatty Osomatsu is quiet and taciturn. When Totoko asked him on a date, he was too depressed to agree and simply ignored her.
    • The fact that Osomatsu suggested the brothers become independent in "Cherry Blossom" in Season 2 is when the others realize they can't keep living off their parents.
  • Professional Slacker: Of all the brothers, he is the one most content with remaining a NEET, and almost never shows any guilt over their circumstances. In his words: "Anyone can be a failure, but you have to work real hard to become a complete piece of shit."
  • Satellite Character: While he has a few quirks of his own, his primary character trait is his connection to his siblings, with him having relatively few scenes by himself and all of the spotlight he gets being on that element. This gets deconstructed in "Letter", where his severe dependency on his relationship with them causes the brothers to start leaving after Choromatsu moves out.
  • Small Name, Big Ego: Believes himself to be worthy of becoming a "big, charismatic legend" despite being a lazy idiot with no particular skills.
  • Too Kinky to Torture: When he gets Jyushimatsu to give him a massage, he demands that he apply enough pressure to his back to nearly kill him and then makes him do it again immediately afterward.
  • Trademark Favorite Food: He's mostly associated with alcohol, especially saké and beer.

     Karamatsu Matsuno
Voiced by: Yūichi Nakamura (Japanese), Ray Chase (English)
Portrayed by: Yusuke Kashiwagi (Normal), Masanari Wada (F6) (Stage Play), Hikaru Iwamoto (Movie)

The second oldest Matsuno sibling. He is a narcissist obsessed with appearing cool to others.

  • Actual Pacifist: His character notes mention that he dislikes hurting people and is generally a very gentle person, though he still participates in group brawls ("Final Sheeeh", "Osomatsu-san, Such As It Was", etc) and punches Osomatsu after the eldest lashes out at Jyushimatsu in "Letter".
  • Based on a Great Big Lie: The Movie reveals that his current bravado is the result of his present self lying to his past self that he would lose his virginity before his brothers and become a manly cool guy.
  • Beneath the Mask: A pretty straightforward case from the get-go, with his theatrics being downplayed or exaggerated depending on the tone and storyline of the episode. He'll also sometimes drop the gimmick entirely, which Yuuichi Nakamura brings up in a PASH! interview:
    Nakamura: I like there being a little bit of the real Karamatsu in every episode. Moments where he's not posing or acting cool. The cast is made up of six siblings, so there should definitely be times where he's being his true self around them.
  • Beware the Nice Ones:
    • He's described as someone who's very difficult to provoke, to the extent that he doesn't even fight back when his brothers mistreat him because he doesn't want to hit them, but in "Letter", he responds to Osomatsu injuring and intimidating Jyushimatsu by decking Osomatsu and then dragging him out of the house.
    • Season 3 features a segment where the brothers have a hypothetical discussion about what kind of pizza they would order to split between them. Karamatsu stays out of it until the end, at which point he performs his usual Large Ham Nice Guy routine and claims that he'd be happy with whatever kind of pizza his brothers chose. The other five aren't satisified with this as an answer and repeatedly try to probe him to drop the act and state his actual feelings. When he refuses to budge, they come to the conclusion that he's actually very selective about opening up to others and give him the nickname "Exclusivematsu" to mock him. This finally gets him to come clean, where he reveals that he is actually incredibly irritated by having to listen to them discuss such an inane and pointless topic and wishes that they'd stop talking entirely, with the suggestion that this is what he often thinks whenever the brothers are up to their usual shenanigans. The other five are understandably taken aback.
    Choromatsu: "I guess Exclusivematsu was a landmine..."
  • Big Brother Instinct: He absolutely adores his brothers despite how they treat him and has surprisingly straightforward sibling instincts towards them:
    • He's the only person concerned about Choromatsu's inability to sleep in "Tidbits Collection", offering to sing him a lullaby each time one of the others wake him up.
    • When the brothers are shot with arrows (representing Todomatsu's unkind words) in "Todomatsu and the Five Demons", he's seen trying to pull the arrows out of Jyushimatsu instead of working on his own.
    • After seeing Ichimatsu and Todomatsu start fighting just as Osomatsu and Choromatsu's argument cools down, he tries to reassure his brothers that he'll always be there to listen to their problems. He promptly gets walked out on by everyone.
    • Taken to ridiculous extremes in "We Caught a Cold", where he gets water for the others by travelling up a frigid mountain to get a special type of melted snow because he thinks ordinary water isn't good enough for them.
    • In "The Ichimatsu Incident", Osomatsu walks in on Ichimatsu trying on one of Karamatsu's outfits and Ichimatsu is forced to act like he is Karamatsu to avoid being ridiculed about it. When the actual Karamatsu finds out about this, he starts pretending to be Ichimatsu so that Osomatsu won't figure out his ruse, and later shoos Osomatsu out of the room to let Ichimatsu escape the situation. Ichimatsu is both awed and infuriated by how thoughtful this is.
    • In "Letter", he gives Choromatsu a Nyaa-chan coin purse that he knew Choromatsu had been interested in as a farewell present, which leaves both Choromatsu and Todomatsu a little dumbfounded. And then of course there's his reaction to Osomatsu hurting Jyushimatsu...
  • Big Ego, Hidden Depths:
    • Despite his narcissism and hamminess, he's actually the most mild-mannered of the brothers and tends to help or oblige the others whenever possible. Word of God also mentions that he's difficult to provoke and doesn't hold grudges — a trait that's best exemplified in "Let's Get a Job", where he's seen carrying a drunk Ichimatsu home moments after the latter threatened to beat him up.
    • In "The Life of Chibita's Flower", he dates an ugly flower fairy with an abusive and possessive personality. When his brothers confront him about this and tell him to leave her, he says that he has to stay by her side or else she'll be lonely.
    • In "Chibita and Iyami's Rental Girlfriend", he reveals that he doesn't actually know how he comes off to people. When Osomatsu tells him that his cool guy act is "painful", he becomes concerned since he doesn't want to put people in pain.
    • It also says a lot that he seems to put the blame for his Butt-Monkey status entirely on the anime production staff, as seen in both "Dayon's Counseling Room" and "Iyami's Counterattack". Apparently, he doesn't think his brothers are the reason behind his abuse at all, despite most of the bad treatment he gets coming directly from them.
    • "Karamatsu and Brothers" reveals that Karamatsu is actually extremely timid, and that much of his kind behavior is a result of him being too much of an Extreme Doormat to be able to say no to another person rather than being an out-and-out Nice Guy.
  • Big Ol' Eyebrows: He has larger eyebrows than his brothers, emphasized by his perpetually fixed angry expression.
  • Butt-Monkey: Mostly during season 1. Even by the standards of his brothers, Karamatsu's life is kind of pathetic. None of the girls he tries to woo are charmed by his "cool guy" persona and instead find him creepy, his attempt at trying to cheer Ichimatsu up ended with Ichimatsu about to punch him, and Episode 5 firmly established how unconcerned Karamatsu's brothers (save maybe Choromatsu) were for him after hearing that he was kidnapped. They even leave him out of the group shot at the end of "ESP Kitty", with Karamatsu (very badly injured) looking on in tears.
  • Cannot Talk to Women: In 3.5's "Virgin Hero" skit, he claims that he can't even speak to female elementary students just because they're girls. Later episodes retcon this, handing the trait over to Choromatsu instead.
  • Casanova Wannabe: Gets ridiculous in his adulthood. He's so desperate that he'll use a love letter and bouquet of flowers as bait when fishing because he's fallen in love with it.
  • Character Development: Seasons 2 and 3 both feature him being himself instead of acting like a Large Ham to seem cool with much more frequency. While this has the effect of showing his more negative traits more openly (mostly the cowardly assholishness exhibited by all of the brothers), it also significantly frees him up from his Butt-Monkey status and allows him to play Straight Man more often (as he's still quite sensible and morally decent when compared to his brothers).
  • Character Tics:
    • Going "Nnnn..?" in response to something confusing.
    • Pressing his hand to his forehead and posing right before saying something hammy.
  • Chuunibyou: Has some aspects of this. He works hard to cultivate an image of himself being cool and mysterious despite living the exact same relatively mundane life as his brothers.
  • Close-Range Combatant: Functions as this in the Tower Defense game Hesokuri Wars.
  • Cool Shades: Almost never seen without them. So much so that, when forced to draw his face, Todomatsu simply draws a large pair of shades over a featureless shape.
  • The Dog Bites Back: At the end of "Karamatsu and Brothers", he refuses to put up with any more of his brothers' demands, though Negative Continuity causes him to quickly revert to his previous behavior in the episodes that follow it.
  • Extraverted Nerd: As much of a NEET as his brothers are, but overflowing with unearned confidence.
  • Extreme Doormat: As Choromatsu points out in "Karamatsu and Brothers", Karamatsu can be pressured into anything as long as the person asking is forceful enough.
  • Forgettable Character: Whenever he speaks there's a good chance that he will be totally ignored, to the point where it seems like nobody else in the room is even aware he exists. This is explained in-universe as a result of him being so painfully cheesy that others dislike talking to him and don't even bother to as a result.
  • The Friend Nobody Likes: While the brothers will turn on each other in a second if it benefits them, Karamatsu is the only one who the others seem to consider it to be fair game to abuse and ignore at all times.
  • Got Volunteered: The occasions where his brothers are most likely to acknowledge him are when they appoint him to be the one to do a particularly dangerous or shitty job that none of them want to do.
  • Gratuitous English: He tends to use English words a lot more than his brothers.
  • Henpecked Husband: Narrowly averts this with the ugly flower fairy due to Status Quo Is God.
  • Heterosexual Life-Partners: Has shades of this with Chibita, who is the only character to consistently express concern for his well being. They end up becoming roommates after Karamatsu moves out in "The Letter".
  • Impossibly Tacky Clothes: Granted, the leather jacket and Cool Shades aren't that bad (even other Matsunos have had urges of trying it on), but Karamatsu's other casual clothes include a sparkly cyan shirt with his own face imprinted on it, similarly-sparkly blue pants, and a pair of shiny golden shoes. Karamatsu just seems to be really fond of Everything's Better with Sparkles when he's not going for his usual look, much to the embarrassment of his brothers, particularly Todomatsu.
    Todomatsu: Why are you dressed like that here?! When, where, and how much did you buy that for?
  • Inelegant Blubbering: After a long period of silence, Karamatsu finally lets loose after his brothers fail to rescue him during "The Karamatsu Incident".
  • In-Series Nickname:
    • "Kusomatsu"/"Shittymatsu", mostly from Ichimatsu.
    • Choromatsu calls him "Kara" during one of 3.5's F6 clips. Other characters, such as Chibita, occasionally call him this as well.
  • I Want to Be a Real Man: And boy, does he try. He can't quite get it, though.
  • Large Ham: He has a habit of acting like he's the cool, mysterious protagonist, and tries to pack as much dramatic flair into his actions as possible. It doesn't work.
  • Leitmotif: Karamatsu's theme, which plays whenever Karamatsu makes an attempt to be cool. It sounds vaguely like it came out of a western, with guitar and whistling.
  • Let's Get Dangerous!: While Shu Matsubara, the head writer of -San, dropped hints about Karamatsu being stronger than he acts in an early interview, we don't really get to see this trope in action until he easily overpowers Osomatsu (the strongest member of the household) after his violent outburst in "Letter". A supplementary excerpt notes that this scene is the first time the audience gets a sense of Kara's actual strength.
  • Modeling Poses: Pretty much always strikes at least one whenever he's on screen. Usually several.
  • Narcissist: He is incredibly self-centered, and tries extremely hard to make himself appear to be a cool, manly guy. Whenever the brothers are lounging around the house (which is often), Karamatsu will likely be inspecting himself with a mirror.
  • Nice Guy: Zigzagged. While he's one of the kindest brothers in adulthood, as detailed in Big Ego, Hidden Depths above, the director describes Karamatsu as someone who isn't "naturally kind" but instead someone who likes the idea of himself being nice and thus behaves accordingly. He's also prone to posturing, which is best shown in "Dayon Tribe" — where he makes a point of dramatically saying he'll rescue Choromatsu after he trips... only to keep running and abandon him without even attempting to help. Season 2's "Karamatsu and Brothers" also suggests that a large part of his altruism simply stems from him being too much of a timid Extreme Doormat to be able to turn someone down rather than genuinely being a good person.
  • No Celebrities Were Harmed: His dress style, speech pattern and mannerisms all directly echo Japanese singer Yutaka Ozaki, something lampshaded in Episode 2.
  • No Social Skills: Has no idea that his "cool guy" routine makes him look even more like a socially inept loser than he would otherwise.
  • OOC Is Serious Business: When he punches Osomatsu and then hauls him outside by his shirt in "Letter", he's completely silent and his expression is almost blank. This alone is a good indicator of just what kind of episode "Letter" is.
  • Out-of-Character Moment: Todomatsu betraying everyone in "Virgin Hero" manages to elicit an oddly vengeful reaction from him.
    Karamatsu: (picks up a large rock) I'm gonna go kill him.
    Osomatsu: Thanks.
    Choromatsu: That's scary! Don't do it!
  • Out of Focus: As a side effect of downplaying his Butt-Monkey status, the second season places less emphasis on his quirks and gives him fewer moments of individual spotlight.
  • Parental Title Characterization : Tends to refer to Matsuyo and Matsuzo as "Mommy" and "Daddy," something the other brothers are not shown doing.
  • Small Name, Big Ego: Seemingly completely oblivious to how disliked he is, and is convinced that he has his own Estrogen Brigade of "Karamatsu girls" waiting in the wings. In reality, women are either weirded out by him or ignore him completely.
  • Stone Wall: Functions as this in the Tower Defense game Hesokuri Wars.
  • Throw the Dog a Bone: He's generally much less prone to getting left out by his brothers in season 2, and they even occasionally voice their admiration of him. In particular, the episode "Karamatsu and Brothers" features Choromatsu showing genuine concern for his doormat nature. Of course, since this goes hand in hand with his taking a level in jerkass it can be argued whether or not this is actually a good thing.
  • Token Good Teammate: While his overdramatic displays of brotherly love are implied to be at least in part just another part of his "cool guy" routine, he is regularly shown to be the one who cares the most about his siblings of the brothers. He's also the least prone of the six to screwing things up for the group, as his deceptive mild-manneredness makes him unlikely to try and rock the boat.
  • Took a Level in Jerkass: While Karamatsu was somewhat of a doormat in season one, he’s significantly more quick-tempered and aggressive in season two. Strangely enough, the shift seems to have made him more integrated with the rest of the group — presumably because he spouts meaningless one-liners far less often than he used to.
  • The Unfavorite: His status as Butt-Monkey seems to extend to parental affection, as Matsuyo callously and stoically shuts down all of his attempts at convincing her to allow him to continue living as one of her dependents whereas she at the very least provides justifications for refusing his brothers. In "Congratulations! Employment!" she punishes him in the same way that she had punished Osomatsu, Jyushimatsu and Ichimatsu simply because the way he spoke annoyed her.
  • Unlimited Wardrobe: While his brothers usually stick to their default sweatshirts, Karamatsu has quite a few alternate outfits and seems to own a lot of extra apparel, ranging from impossibly tacky stuff like sparkly jeans and a tanktop with his face on it to more ordinary things like coats and cable-knit sweaters.
  • Youthful Freckles: He had these in high school, as the movie shows. In truth, they're really a bad case of acne.

     Choromatsu Matsuno
Voiced by: Hiroshi Kamiya (Japanese), Sean Chiplock (English)
Portrayed by: Keisuke Ueda (Normal), Kento Ono (F6) (Stage Play), Ren Meguro (Movie)

The third eldest sibling of the group. He is The Straight Man for his brothers' antics, and is also an idol otaku.

  • A Date with Rosie Palms: Osomatsu claims he's actually doing this when he's supposedly looking for employment, which Choromatsu himself confirms in "Dayon Tribe". When Osomatsu catches him in the act using one of his own porn mags, it earns Choromatsu the nickname "Fappymatsu". When forced to draw his face from memory, Osomatsu simply draws the outline of a head and writes "Fappy" over it.
  • Beady-Eyed Loser: While this applies to all of the sextuplets relative to most other characters, Choromatsu is drawn with the smallest pupils of the six to denote him as the neurotic nerd of the group.
  • Berserk Button: When Todomatsu refers to him as an "idol otaku", Osomatsu remarks that he's accidentally stepped on a landmine. Choromatsu proceeds to absolutely destroy Todomatsu by declaring that he shouldn't have been born because quintuplets are far better than sextuplets.
  • Bitch in Sheep's Clothing: Not nearly to the same degree as Todomatsu, but Choromatsu tends to use his status as The Reliable One as an excuse to passive-aggressively mock his brothers for their comparative uselessness.
  • Book Dumb: On his job application form, he writes that he has a kanji proficiency of 6, which is about the equivalent to having a grade schooler's level of comprehension. He's also noted to have done very poorly in school despite putting on airs of being a Teacher's Pet.
  • Butt-Monkey: Not to the extent of Karamatsu, but he tends to be the most verbally abused of his brothers.
  • Can't Hold His Liquor: When the brothers go out for drinks in "Let's Get a Job", Choromatsu gets so sloshed that Todomatsu and Osomatsu end up having to physically drag him home as he rambles at them in a drunken rage. This gets a brief Call-Back in "Dayon Tribe", where he keeps throwing up after drinking saké with his older brothers.
    Osomatsu: You still can't hold your liquor, huh?
  • Cannot Talk to Women: He tends to get nervous and stuttery around pretty girls. Even his stoic F6 form starts falling apart upon encountering Totoko for the first time.
  • Catchphrase: A minor one, but he has a tendency of describing things that excite him as something that "really lights your ass hair on fire".
  • Character Development:
    • In "Dayon Tribe", he confronts his inability to actually take action and chooses to leave Dayon's insides to continue his life. This continues into the following episode, where he finally packs his Nyaa-chan merch away and becomes the first to move out on his own accord.
    • Seeing his younger self engage in an even more exagerrated version of his Feigning Intelligence schtick in the movie causes him to lighten up and gain a bit more self-awareness. By the third season, he's comfortable making fun of himself for it, something he'd never do previously.
  • Close-Range Combatant: Functions as this in the Tower Defense game Hesokuri Wars.
  • The Conscience: Despite the fact that he can get absurdly petty at times, he's usually the most morally balanced member of the group and is constantly trying to get his brothers to look for jobs instead of mooching off their parents. Notably, he's the only one of the brothers who seems to be genuinely concerned when Matsuzo admits that his marriage has lost its spark.
  • Covert Pervert: While he's the most buttoned-down brother, he's also frequently suggested to be the horniest. In "Choromatsu and Ichimatsu" he even admits that most of his interest in idols stems from his lust for them. His nickname's "Fappymatsu" for a reason, after all.
  • Cuteness Overload:
    • Reacts to Totoko this way.
    • He similarly can't hold back when he's attending Nyaa-chan concerts.
    • He really just reacts this way to any attractive girl. Todomatsu is even able to incite this just by showing him a picture of a girl on his phone.
    • In the movie he goes crazy over high school Totoko to the point Jyushimatsu has to act as the voice of reason.
  • Dirty Old Man:
    • In the "Choro-sensei" skit, he's the vice principal of a school and sees everything as perverted.
    • His behavior towards Totoko and Nyaa-chan in the movie can be considered this. In the memory world, he lusts after high school Totoko and junior-high Nyaa-chan, while he himself is an adult in his 20's. This is made even creepier by the fact that seeing them makes him want to live in the memory world forever, implying that not only is he attracted to the child versions of his crushes, he actually prefers them to their adult counterparts. Even his brothers are creeped out by this.
  • Embarrassing Nickname:
    • A particularly naive comment about girlfriends earns him the nickname "Cherrymatsu" in the Christmas special. note 
    • Osomatsu starts calling him "Fappymatsu" after accidentally walking in on him jerking off. The nickname and its variant, "Fappyski" sticks with him in later episodes.
  • Eye Scream: An unlucky victim of this in “Chibita’s Revenge”, in which Chibita supposedly stabs oden skewers into his eyes, then pours mustard onto them the next day.
  • Fanboy: He's a big fan of Hashimoto Nyan, a cat themed Idol Singer.
  • Feigning Intelligence: In "Accident?", Osomatsu claims that the only reason he's always reading books and employment magazines is because he wants people to think he's The Smart One. The movie shows he was even more extreme in high school, wearing fake glasses, talking in a higher voice and acting like he was serious about his studies when his bag was filled with porn and a test that he failed.
  • Fetish: An in-character magazine interview establishes that he's into something, but he refuses to tell the interviewer what it is.
  • Foolish Sibling, Responsible Sibling: Technically he would be the Responsible Sibling to the rest of his brothers' Foolish Sibling, but this comparison also applies to Osomatsu and himself respectively because of their elder brother status. Choromatsu is really the only one actively trying to find jobs and avoid conflict, while Osomatsu just tends to let things happen and doesn't lift a finger until something conflicts with his way of life. This is played with to a degree, as Choromatsu is repeatedly shown to be just as uninterested in finding a job as Osomatsu is, but presents himself as actively seeking employment in order to seem more responsible in comparison.
  • Fragile Speedster: Functions as this in the Tower Defense game Hesokuri Wars.
  • Gag Haircut: "Choromatsu Incident" features him getting a terrible-looking brown dye job in a poorly-conceived attempt at reinventing himself as a cooler person for the new year. His younger brothers all struggle to inform him of how bad it looks as gently as possible, only for Osomatsu and Karamatsu to immediately mock him for it the instant they see it.
  • Hidden Depths:
    • He initially seems like the sanest member of the cast, but episodes like "Choromatsu Rising" make it clear that he's Not So Above It All and Todomatsu often mocks him for pretending to be better than he actually is. Choromatsu himself caves in and admits that he doesn't really want to graduate from being a NEET in "Godmatsu", but manages to overcome this attitude by the time "Letter" rolls around.
    • "Dayon Tribe" establishes that he's aware of his hypocritical nature and is genuinely ashamed that he can't become a normal member of society.
  • Hypocrite: He ends up being the brother who most wants out of his brothers' NEET lifestyle, and he knows how pathetic his life is and nags at the others to change theirs, but he participates in their lifestyle wholeheartedly and hasn't done much about his own situation. He manages to get over his hypocrisy in "Letter", finally landing a job and motivating the the others sans Osomatsu to follow him.
  • In-Series Nickname:
    • Karamatsu calls him "Choro" during one of 3.5's F6 clips.
    • After "Accident?", "Chorofappyski" really stuck with his colleagues, with Todomatsu using it more often than his actual name.
  • Journey to Find Oneself: Goes on one after Nyaa shatters his delusions of her in "Just Don't" that leads him around the world. While the episode ends with him living in tranquility in the forest surrounded by woodland animals, his follow-up appearance in the "Choromatsu Memorial Hall" segment reveals that all he gained from the experience was an even greater sense of unearned entitlement.
  • Know-Nothing Know-It-All: Believes himself to be the smartest and most capable of his brothers despite the fact that his intelligence is well below-average for his age, he doesn't have any particular talents, and he lacks even the most basic social skills. In fact, the Season 3 skit, "Well, Yeah..." proves that he can sometimes be even dumber than Jyushimatsu and Osomatsu, arguably the two dimmest brothers of the bunch.
  • Narcissist: It isn't as pronounced as with Karamatsu or Todomatsu, but Choromatsu clearly thinks very highly of himself as the most responsible and proper brother and is very easily won over by empty flattery relating to his status as such. During moments where he's particularly lacking in self-awareness, he will giddily praise himself for being so much better than his siblings without even a hint of irony.
  • Nerd Glasses: The movie showed that Choromatsu used to wear fake glasses in high school to appear smarter than he really was.
  • Nerds Are Virgins: While all of the Matsus are virgins, Choromatsu is the most frequent target when it comes to mocking one of them about it. Naturally, he's the group's resident Otaku. The season 3 opener Lampshades this by having Jyushimatsu accuse him of being responsible for the sextuplets' NEETdom by being a virgin, only for Choromatsu to point out that all of the other five are also virgins.
  • Nervous Wreck: Tends to become anxious and worried easily.
  • Normal Fish in a Tiny Pond: Choromatsu would normally come across as a desperate, self-important and painfully-geeky idiot who is all talk and no action to the average observer. Luckily for him, though, his other brothers are all such complete social wrecks that he actually manages to come off as rational and responsible when opposite them.
  • Only Sane Man: He's usually the Butt-Monkey to most of his brothers' weird and illogical actions, but episodes like "Todomatsu and the Five Demons" make it clear that he can act just as strange as the rest of them.
  • Otaku: He's drawn with dakimakura, is a big fan of an Idol Singer and is mentioned more than once to like anime and video games.
  • Out of Focus: The first episode gives him more screen-time and dialogue than any of the other brothers, including Osomatsu himself, but his role is severely downgraded in the series proper. This is averted in the second cour and especially the second season, where he's given more screen-time and development than he had in the first.
  • Perpetual Frowner: While he's fully capable of smiling, his neutral mouth shape makes him always look like he's giving an anxious frown.
  • The Reliable One: Uses his status as the most stable and sensible son as evidence that he will eventually produce a grandchild for his mother as bait to let him continue living with her. This is deconstructed repeatedly throughout the series, as it's made clear that Choromatsu puts much more effort in cultivating his image as the reliable and sensible son than he does actually doing anything reliable or sensible.
  • Small Name, Big Ego:
    • A subtle example. Choromatsu takes a great amount of pride in being the smartest and most sensible sibling, when in reality his intelligence is mostly limited to pointing out the stupidity of the other five, and he's just as lazy unmotivated as they are. He is called out on this several times.
    • Taken Up to Eleven in the "Choromatsu Memorial Hall" segment, where he founds an entire museum dedicated to himself that consists of nothing but bragging about his achievements (of which there are so few that he either has to heavily embelish the truth or outright lie) and features an entire wing dedicated to all the success he believes he will attain in the future due to being so much smarter and more mature than his brothers are. One of the displays features him as a god shining above his lowly siblings. Todomatsu, who is unwillingly brought on a tour of the museum, is understandably floored by both Choromatsu's ego and his lack of self-awareness.
  • The Smart One: Generally presented as being the brains of the group, though he's occasionally called out on simply putting on airs of being smart while actually being just as stupid as his brothers are.
  • Smart People Wear Glasses: He dons a pair of glasses during the F6 stunt, and then continues to wear them in professional settings. They seem to part of his Feigning Intelligence schtick, as Word of God states that they're purely aesthetic and don't even have any lenses in them.
  • Straight Man: He trades this role with Todomatsu from time to time.
  • Teacher's Pet: Back in high school he shamelessly toadied to his teachers to project the image of being an honor student onto himself despite otherwise doing terribly at his schoolwork.
  • Thousand-Yard Stare: When sufficiently embarrassed, Choromatsu tends to go absolutely silent and give a dead-eyed, emotionless stare.

     Ichimatsu Matsuno
Voiced by: Jun Fukuyama (Japanese), Kyle McCarley (English)
Portrayed by: Ryo Kitamura (Normal), Yuuya Asato (F6) (Stage Play), Tatsuya Fukazawa (Movie)

The fourth oldest brother. He is a rather lazy and unmotivated man with an affinity for cats.

  • Animorphism: Performs this by fusing with a street cat in the second episode. Later episodes give him the ability to do this even without the cat, and episode sixteen has him partially transforming by just sprouting the ears and the tail.
  • Beneath the Mask: As the series progresses it becomes increasingly obvious that his apathetic disposition is just an act, and this fact is regularly lampshaded within the show itself. According to one of his character outlines and a cast interview, the entire purpose of "The Ichimatsu Incident" was to showcase his actual self.
  • Beware the Quiet Ones:
    • Because of his withdrawn and hard-to-read nature, the rest of his family fears any and every action he might do in the future. He even uses these fears as a bargaining chip to stay in the house with Matsuyo in "Let's Become Independent".
    • Being treated badly by his brothers can cause him to show an outright furious side. He initially wants to go home after the insulting speech Todomatsu makes towards his siblings in "Todomatsu and the Five Demons", but when he learns the real reason his brother was being mean he was absolutely livid and attempted to defecate on one of the tables. He's also the brother going towards Totty at the end, being the one implied to beat the crap out of him.
    • In general, its noted that Ichimatsu is very dark and criminal like by even the actors themselves, and the end of the year special highlights some of his more malicious moments in the series.
  • Cat Stereotype: Given his affinity for cats and his inexplicable ability to turn himself into one, he has some traits. He fits pretty well under the "Black" cat stereotype of being antisocial and proclaiming himself unlucky.
  • Cannot Spit It Out: He could have saved himself from complete embarrassment in "The Ichimatsu Incident" had he quickly owned up to wearing Karamatsu's clothes to feel cool, especially since Osomatsu disclosed that he also felt the same way. He also mentions that this is the reason why he doesn't have any friends.
  • Can't Hold His Liquor: When the brothers go drinking in "Let's Get a Job", Ichimatsu ends up passing out and has to be carried home by Karamatsu. He may have been faking this, however, since he and Karamatsu are only seen drinking water in that episode.
  • Cloud Cuckoolander: Not nearly to the same extent as Jyushimatsu, but he's generally the only brother capable of being anywhere near his wavelength. His obsession with cats, which reaches a point where he occasionally abruptly transforms into one himself is the most obvious example.
  • Cool Big Bro: He genunely gets along well with Jyushimatsu, being willing to give him brotherly advice and even be more open about his soft side around him.
  • Creepy Monotone: Generally speaks in a dour monotone.
  • Does Not Like Shoes: Of the brothers, he's the one most commonly depicted barefoot and he generally opts out of closed-toe shoes when leaving the house. This is used for dramatic purposes when he ditches his usual sandals as he finally departs from the Matsuno household in "Letter" - the last of Osomatsu's brothers to do so.
  • Dreary Half-Lidded Eyes: He is drawn with half-lidded eyes due to his distant personality.
  • Driven to Suicide: When the joke calls for it, he will usually resort to this.
    • When it was decided that Ichimatsu would become the new protagonist in episode 18, he opted to drive off a cliff because he didn't want the spotlight.
    • A brief look at his weapons arsenal in "Godmatsu" shows that he was willing to blow himself up if it meant taking out Godmatsu, too.
  • Dull Eyes of Unhappiness: His eyes lack the glint that his brothers' do.
  • Dull Surprise: It takes a lot to get an emotional reaction out of him.
  • The Eeyore: The most pessimistic and self-critical member of the cast. "ESP Kitty" reveals he mentally convinces himself that he neither needs nor deserve friends and his version of the Type-B "Six Same Faces" single is essentially just him berating himself to whoever is listening.
  • Fetish:
    • His initial character outline mentioned the idea of him secretly being a masochist, which is why Jun Fukuyama improvised a rather odd scream during the flag-stabbing scene in "It's a Birthday Party, Dajo".
    • When it's his turn to look after the brothers in "We Caught a Cold", he takes advantage of everyone's disoriented state to act out a sado-masochistic roleplay with them. It's only later on that anyone registers how weird the entire situation was.
      Choromatsu: That wasn't taking care of us, it was obedience training!
    • His interest in cats goes a little further than the norm — his dirty mags are about cat girls, an in-character interview about fetishes had him listing "cat paws" as his, and "School Matsu" has him awkwardly covering his crotch upon seeing a cat walk by. In the final episode, he outright says he wants to have his species changed to cat.
    • The Christmas porn he got for one of his brothers to randomly receive during the Matsuno gift exchange is incest-based.
  • Flanderization:
    • -San's second cour takes Ichimatsu's affection for cats and ramps it up tenfold, to the point where he expresses the desire to species change into one come "Osomatsu-san As It Was".
    • Season 2 tends to place much more emphasis on his inner fragility than season 1 did, causing it to begin to eclipse apathetic surliness as his defining character trait.
  • Four Is Death: The fourth-oldest brother is also the most morose, depressive and cynical. Fitting with the connotations of the trope, he has threatened to kill both himself and others on many occasions.
  • Girly Run: In many of the opening sequences, he is shown to keep his arms closer to his sides than his brothers while running, as well as leave his palms open instead of clenched into fists. This is likely done to indicate his lack of energy and enthusiasm rather than any kind of femininity, though.
  • Green-Eyed Monster: As his treatment of Karamatsu and his reaction to seeing anyone with a girlfriend show, this guy has...issues.
    • When Jyushimatsu goes on a date with a girl in "Jyushimatsu Falls in Love", while not vocal about his discomfort like Osomatsu, he bangs his head on something hard until he starts bleeding.
    • In the "Black Santa" sketch, when the couple next to him start acting all lovey-dovey, he gets so upset that he literally bursts into flames.
    • In "Virgin Hero", seeing a couple makes him so angry that he turns into a slug monster.
  • Hidden Depths:
    • He starts out rather sullen and creepy, but through his spotlight episodes and interviews he's revealed to be surprisingly multi-layered. And, as Fetish can attest to, he's got more than a few kinks.
    • He's a lot more emotionally dependent on his brothers than he'd like anyone, including himself, to think. ESP Kitty first lays it out in episode 5, but it's demonstrated constantly and subtly over the first two cours. In "Letter," he eats exactly half of one treat when there were three whole ones in total, as if in remembrance of when they were all under one roof and had to always share food. Made all the more significant when these were the same treats the brothers had fought intensely over earlier in the season.
    • When all but his insides are turned invisible in "Super Detergent", it's revealed that his heart is a tiny and incredibly fragile precious gemstone.
  • Hidden Heart of Gold: To an extent. He's certainly not nice but he's not quite as scary as he acts, and it's quickly established (both in-universe and out) that he enjoys spending time with his brothers despite claiming otherwise. Todomatsu actually calls him out on this behavior in Episode Thirteen.
    Todomatsu: Why don't you drop that character already?
    Ichimatsu: (irritated) What character?
    Todomatsu: You're totally a normie. It was proved by the ESP kitty.
  • I Can't Believe a Guy Like You Would Notice Me: For his version of the Type-A "Six Same Faces" single.
  • I Just Want to Have Friends: Taken to heartbreaking levels in episode 5 of -San, where it's revealed that he's scared of being alone and his inability to befriend people really bothers him.
  • Irrational Hatred: He's extremely hostile and aggressive towards Karamatsu. According to head writer Shuu Matsubara, this behavior stems from Ichimatsu being jealous of how confident and happy Karamatsu is even though he's supposed to be "the same" as Ichi. We get more insight into Ichimatsu's envy issues in "The Ichimatsu Incident", which is kick-started by him trying on Karamatsu's Iconic Outfit while the latter is asleep and later features his inner monologue violently switching between reverence and anger as Kara saves him from an embarrassing confrontation with Osomatsu.
    Karamatsu, Karamatsu, Karamatsu! Is he a god!? Is he actually a god!? Actually, just die!
  • Kindhearted Cat Lover: He tends to be more social around cats, and they tend to like him back. If episode 10 is anything to go by, this friendship extends to tigers.
  • Lazy Bum: He states that he has no will to do anything.
  • Loners Are Freaks: He doesn't socialize well, and he generally comes across as creepy to most people. Even his preferences are somewhat odd.
  • Long-Range Fighter: Functions as this in the Tower Defense game Hesokuri Wars.
  • Messy Hair: The only head of hair that looks noticeably different from his brothers.
  • Middle Child Syndrome: He feels that he can't catch up to his brothers in terms of interaction, and became a loner as a result of his inability to do so. He also doesn't seem to have any real conversations with his brothers, sans Jyushimatsu.
  • Mighty Glacier: In Hesokuri Wars.
  • Not Good with People: You don't need social skills to be friends with cats.
  • No Social Skills: Rarely interacts with anyone outside his family, but when he does, he tends to mumble and avoid eye contact. When he attempts to make small talk with a couple in the "Black Santa" sketch, he aggressively repeats anything they don't respond to, stares at them, and mutters things like "I'm going to kill you" just loudly enough for the man he's sitting next to to hear him.
  • Not So Stoic: He's generally either grumpy or weirdly monotone most of the time, but if there comes a time when something really touches his nerves, he'll react to it with real emotion.
    • In "ESP Kitty", he was especially and quite notably furious when the Kitten admitted that he was lonely.
    • His outbursts in "Todomatsu and the Five Demons" were very unusual for him.
    • When Dekapan was going to inject him with the "Feelings Medicine" (using a giant syringe), he panicked and tried to run away, prompting Jyushimatsu to comment that he'd "never heard [him] yell so loud."
    • He spends the entirety of "The Ichimatsu Incident" having an internal freak out because he's stuck in an embarrassing situation that he can't lie his way out of.
    • When Jyushimatsu's usual chatter starts getting a little creepy and unsettling in "Jyushimatsu and Concepts", Ichimatsu leaves the conversation to go to the bathroom. Once he disappears off-screen, we hear him screaming and looking for the other brothers.
  • Paper Tiger: He's so belligerent that even his own mother is vulnerable to his intimidation tactics, but both Fujita and Matsubara maintain that Ichimatsu can't really take charge or do much during serious disputes and will panic if the three older brothers aren't around.
  • Performance Anxiety: Place him under even the slightest bit of pressure and he's likely to buckle under it and be thrown into a screaming, incomprehensible panic.
  • Perpetual Frowner: If he smiles, expect it to be a smug grin at another person's misfortune.
  • Shrinking Violet: Has the most trouble with interacting with other people out of the brothers. While he's comfortable around cats, he only barely holds proper social interactions with the rest of his family, and typically fails to do so with anyone else. In "Iyami's Counterattack" he intentionally kills himself due to the pressure of becoming the main character being too much for him.
  • Sitcom Arch-Nemesis: While his hostility towards Karamatsu is pretty one-sided, he has a simpler but more active dispute with Todomatsu, often calling him out on his sly behavior and bullying him about things like his porn stash. Fittingly, Todomatsu's voice actor revealed that Ichimatsu is ranked at the bottom of his infamous "favorite brother" list.
  • The Slacker: Has the dubious honor of being the laziest person in a group of six lazy people.
  • Slasher Smile: All of his brothers are quite good at it, but his are far more unsettling in adulthood.
  • Sore Loser: In "Mahjong", where he shows a very pissy attitude if cornered during the game, flips the mahjong table in frustration (Karamatsu's nickname for him as a player is actually Table-Flipping Ichimatsu, so this seems to be a common occurrence) and suggests that they stop playing and go to sleep immediately after losing, much like a child.
  • Stepford Smiler: Back in high school, he still suffered from social anxiety but made a conscious effort to interact with others and appear friendly and well-adjusted. The pressure eventually got to him and he stopped trying.
  • The Stoic: Seems to be this in the first few episodes, but becomes Not So Stoic as the show progresses.
  • Stopped Caring: The Movie reveals that he's had his crippling social anxiety since at least high school, but also shows that he used to make a concerted effort to be more outgoing and live a fulfilling life while he was a student. By the series proper, he has completely withdrawn from society and seems to have resigned himself to being a recluse.
  • Sugar-and-Ice Personality: In his adulthood, he becomes more cold and antisocial towards everyone, but it's clear that he still wants to make connections with other people and very much loves his brothers, even if he doesn't show it most of the time.
  • Those Two Guys: While all of the brothers are basically inseparable, Ichimatsu and Jyushimatsu in particular are almost always with each other.
  • Took a Level in Idealism: Becomes less cynical over the course of the first season. By season two he’s making an effort to avoid self-deprecating thoughts, even arguing with his inner voice when it labels him a loner in “Choromatsu and Ichimatsu”.
  • Torture Technician: The brothers look to him whenever they need someone to be tortured. While he's not as strong as Jyushimatsu or as capable of emotional torture as Todomatsu, he's great at physically torturing people.
  • Tsundere: His character notes describe him as such, even drifting off-topic to tease him about it. The trait gets some limelight in "The Ichimatsu Incident", where he lets out an absolute mood-swing of an inner monologue upon realizing that Karamatsu is trying to save him from his collapsing "Fawlty Towers" Plot.
  • The Quiet One: He tends to stay silent during gags where everyone chimes in with a comment, which often prompts Choromatsu to ask him to at least say something.
  • The Unintelligible: His delinquent version in "School Matsu" is this, to the point it's obvious the subbers just used Wingdings (the original fansubbers just smashed the keyboard) in order to "translate" whatever he says.
  • Used to Be More Social: The Movie shows him smiling and hanging out with friends during his high school days, a far cry from the standoffish loner that he is now. However, it also shows that even back then he was prone to anxiety and negative thoughts; he just had more drive to power through them.
  • Whole Costume Reference: In "Let's Become Independent", he wears a suit and hairstyle heavily resembling hide of X Japan.

     Jyushimatsu Matsuno
Voiced by: Daisuke Ono (Japanese), Michael Sinterniklaas (English)
Portrayed by: Ren Ozawa (Normal), Shinichi Wago (F6) (Stage Play), Daisuke Sakuma (Movie)

The fifth born son. He's the energetic goofball of the group and loves to play baseball.

  • Ambiguous Innocence: He's most definitely a good guy, but it's strongly implied between both the series and Word of God that much of his behavior is faked. Consequently, one really can't get how genuine he really is. "Kerosene" shows a much darker side of him, but whether it reveals a crack in his supposed facade or it's just an Out-of-Character Moment is still in the air.
  • Beware the Nice Ones: "Kerosene" establishes that he can be just as horrible as his brothers when it comes to certain matters — such as refilling the kerosene tank. Not only does he feign sleep so that no one will ask him to, but he eventually just orders Choromatsu to do it instead.
  • Beware the Silly Ones:
    • It's hard to particularly piss him off, and when he does get angry he's usually just going along with his brothers and doesn't necessarily lose any of his usual quirks. However, in his skit with Ichimatsu during "Period Drama Osomatsu-san" Jyushimatsu really loses his cool when a bunch of people start talking to him at the same time in order to find out if he can figure out what each person is saying, and he then proceeds to beat the hell out of everyone while yelling at them to shut up. Mind you, he wasn't smiling while doing that.
    • He also isn't smiling at all when he (along with his other brothers) are punishing Karamatsu and Iyami & Chibita in Episodes 5 and 10, respectively.
    • In "Kerosene", he ends up strangling Ichimatsu when the latter attempts to calm him down during a tantrum.
  • Big Brother Mentor: In "The Eitarou Family", Eitarou looks up to him for his outgoing personality and athletic constitution. Despite some failings on Jyushimatsu's part, he does care for Eitarou and tries to help him make friends. Unfortunately, Jyushimatsu ruins everything when he finds out Eitarou got a girlfriend.
  • The Big Guy: Generally presented as the most physically capable of the brothers, and has a seemingly limitless supply of energy.
  • Catchphrase: "Hustle, hustle! Muscle, muscle!"
  • Close-Range Combatant: Functions as this in the Tower Defense game Hesokuri Wars.
  • Cloudcuckoolander: His defining trait is his goofiness in comparison to his brothers. Later segments show that he's aware of how he can come off and can downplay his antics when he wants to.
  • Did Not Get the Girl: In "Jyushimatsu Falls in Love", it's revealed that he'd been hanging out with a country girl he likes for the past month and was planning on confessing to her. It doesn't work out as planned; she reciprocates his feelings but they're unable to get together because she has to go back home at the end of the month.
  • Dumb Jock: The dimmest of the brothers and almost always seen with a baseball uniform on if he's not wearing his usual yellow sweatshirt.
  • Fetish: His porn stash drops the rather disturbing implication that he gets off to watching insects.
  • Flanderization: The first half of season one depicted him as quirky and outlandish but still capable of behaving like a normal person. The second half takes his Cloudcuckoolander tendencies up to eleven, with Iyami even criticizing him for relying too much on his weirdness in "Iyami's School". He seems to have returned to his original characterization in season two, though he still retains a few unnatural abilities.
  • Former Teen Rebel: Subverted in The Movie. Promotional materials show his high school self looking and acting like a violent delinquent, but the movie itself reveals that it's just a put-on he's doing for fun.
  • Gratuitous English: Yells random words like "butterfly" and "muscle" even when they don't make sense in context.
  • Hair of Gold, Heart of Gold: In his F6 form.
  • Hidden Depths:
    • His official descriptions describe him as a wild card, and it shows prominently. He's well aware of his stupid nature and tones it down when necessary (or just tries to play innocent) and is pretty perceptive. He may also be Obfuscating Stupidity, seeing that he appeared to be completely normal in the pictures until he hit high school and also has stock as shown by the last scene of episode 14's "Todomatsu's Line".
    • Season 3 emphasizes his emotional maturity relative to his brothers much more, and actually has him play the Straight Man at several points to emphasize just how inept the others are at understanding the thoughts and feelings of others.
  • Hidden Heart of Gold: The movie reveals that Jyushimatsu pretended to be a deliquent in high school but wasn't very good at it from changing back to a smile when he thought no one was looking and not zipping up his pants so his butt was showing.
  • Humanoid Abomination: Occasionally appears to have supernatural and downright disturbing powers, such as splitting himself into millions of tiny, bloodstream-infiltrating clones and turning everything and everyone into kanji. "Super Detergent" reveals that his internal organs are seemingly their own living creature.
  • Idiots Cannot Catch Colds: The concept is referenced in "Kerosene", where Choromatsu expresses surprise that Jyushimatsu (who has wrapped himself in blankets) can feel cold despite being an idiot.
  • Intergenerational Friendship:
    • Appears to have one with Dekapan, who allows him to both work for and live with him in "The Letter".
    • He also seems to have one with Shonosuke Hijirisawa, oftentimes glomping him whenever the little guy appears.
    • "The Eitarou Family" centers around him becoming friends with a little boy named Eitarou, even taking him on as an "apprentice" and teaching him jokes so he can make friends his own age but when Eitarou gets a girlfriend, Jyushimatsu disowns him.
  • Keet: He's certainly got a lot of energy. In episode 5 of -San, he makes a running start to answer the phone and breaks the front door in the process. In the finale, he becomes so excited by the prospect of playing his very first baseball game that he dons a ridiculous baseball-themed superhero costume and scores a home run for the opposing team.
  • Kill the Cutie: Parodied in one of the skits that aired before The Movie. While trying to come up with an emotional plot for the movie, Todomatsu determines that the easiest way to do it would be through killing Jyushimatsu off. He promptly begins trying to strangle Jyushimatsu to death to get it to happen.
  • Kindhearted Simpleton: In "ESP Kitty", he decides to go to Dekapan to give Ichimatsu the ability to talk to cats because, knowing how much Ichimatsu loves cats, he won't be as lonely anymore. He's also the only one of his brothers that wasn't actively trying to ruin Todomatsu's chances at a date during "Todomatsu and the Five Demons" (note how he's the only one to try and clean up the mess he made). He's just sort of playing along with the others' scheme and goofing off. Todomatsu seems to realize this at some point and manages to take the other four brothers into the break room instead.
  • Lovable Jock: The most athletic of the brothers and also the most consistently kind one.
  • Manchild: Even more than the rest of his brothers, seeming more like a child than an adult. This sometimes causes the others to treat him like The Baby of the Bunch even though he's the second youngest.
  • Meaningful Name: Spelled differently, his name can be read as the Japanese name of the society finch, and official character descriptions make certain note of the fact that he's the most birdy of his brothers.
  • Morality Pet:
    • Seems to be this for Todomatsu, as the latter doesn't hold any resentment towards him for the Sutabaa incident.
    • He also seems to be this for Ichimatsu to an extent, since he gets along with him the best out of all the brothers.
  • Nice Guy: One of his defining traits. He tries as much as possible to make people happy. He once interrupted a girl's suicide attempt and then kept seeing her afterwards to make her smile again.
  • No Indoor Voice: He tends to shout most of his lines. Lampshaded at the end of "We All Got Sick", where he himself complains that his brothers (who are acting just like him at the moment) are really loud.
  • OOC Is Serious Business: In "Jyushimatsu Falls in Love", he becomes politer and less hyperactive after he starts seeing a girl. He also cries like a baby when he thinks about how she rejected him.
  • Out-of-Character Moment: In "The Calming Osomatsu", he plays an irritable forensics investigator who is trying to help the inspectors Todomatsu and Choromatsu solve a crime. None of his usual quirks come up during the skit.
  • The Pollyanna: In a comical variant, working as a slave for a Black Factory doesn't seem to bother him one bit.
  • Perpetual Smiler: His default expression is a goofy open-mouthed smile that sometimes stays in place even when he's distinctly unhappy about something. Generally when he's expressing an emotion that can't be conveyed through a smile at all, his mouth will be conspicuously covered up, either by his sleeves, the camera angle, or the environment. The fact that his smile disappears when he starts crying in "Jyushimatsu Falls in Love" is what makes his brothers realize just how broken up he is about getting dumped. Season 2 tones this down substantially, as while he's still more often than not seen smiling, he's much more likely to change his expression to fit his mood.
  • Ping-Pong Naïveté: To go along with his Ambiguous Innocence. This is best shown in "This is Totoko", where he assumes that he was invited to Totoko's room along with his brothers to play baseball with her, but later asks if Totoko's big announcement is that she was in a porno.
  • Raging Stiffie: Spends all of "Star of Hope Todomatsu" with a hard-on that refuses to go down.
  • Spell My Name with an "S": In most official material, his romanized name is spelled as "Jushimatsu" or "Jyushimatsu" (which is what Crunchyroll went with), but his name can also be spelled "Jyuushimatsu" or "Juushimatsu".
  • Stone Wall: Functions as this in the Tower Defense game Hesokuri Wars, albeit a much faster and more AP-consuming one than Karamatsu.
  • Temporary Bulk Change: He's supposed to have the same body type as everyone else, but he'll often gain muscles and/or weight for the sake of a gag and then lose said bulk once the gag is over.
  • Those Two Guys: While all of the brothers are basically inseparable, Ichimatsu and Jyushimatsu in particular are almost always with each other.
  • Weirdness Coupon: Despite not understanding it themselves, the sextuplets usually accept his inexplicable weirdness and occasional otherworldly abilities as just Jyushimatsu being Jyushimatsu.
  • Wide Eyes and Shrunken Irises: Part of his default expression.
  • Wrestler in All of Us: If one of the other brothers isn't cooperating with a plan, Jyushimatsu will be called upon to put him in an octopus hold. The thing is, he never pays enough attention to the flow of the conversation and always ends up putting the asker in the hold instead.

     Todomatsu Matsuno
Voiced by: Miyu Irino (Japanese), Max Mittelman (English)
Portrayed by: Ryotaro Akazawa (Normal), Yuuki Nakayama (F6) (Stage Play), Raul (Movie)

The youngest out of the sextuplets. He is an effeminate man and the most socially adept of the brothers.

  • All There in the Manual: "Todomatsu's Line" establishes that he has his older brothers ranked according to how much he likes them. In-Universe, he's prevented from revealing who's in last place, but one of Irino's interviews state that it's Ichimatsu.
  • The Baby of the Bunch: The youngest of the brothers, and still needs his brothers to help him with things like going to the bathroom in the dark. He also has a couple of problems with this, since being the youngest brother meant that he's frequently last in many things. Because of that, he wants to step out of his brothers' shadow, trying to climb up the social ladder to dig himself out of the social hole they put themselves in.
  • Bitch in Sheep's Clothing: He may act cute and sweet around women, but he's actually the most conniving of the brothers by far. Case in point, he offered to decline from the custody interview so he could figure out a way to support his parents himself, but that was only because he knew he'd get on his mother's good side for that speech and pass the interview. "Todomatsu and the Five Demons" cemented this trope even further, with Choromatsu basically calling him two-faced. When the brothers look at each other's internal organs in "Super Detergent", they initially believe that Todomatsu has the most normal set of the six of them, only to realize that he has no heart whatsoever.
  • Camp Straight: He's very effeminate, but is just as desperate to get laid as his brothers are. Ichimatsu calls him out on deliberately invoking this trope in an attempt to make himself seem more cute. From what we see of Todomatsu's character, Ichimatsu was right on the money.
  • Character Development: Season 2 shows Todomatsu handling himself much better in romantic situations than season 1 ever did, with him proactively asking for the phone number of a girl and making good conversation during a mixer. This gets lampshaded during a season 2 sketch, where he has his status as a sextuplet temporarily revoked due to not being enough of a hopeless virgin.
  • Characterization Marches On:
    • While there were always hints that he was not as nice as he appeared, in the first few episodes he's mostly characterized as being In Touch with His Feminine Side and The Baby of the Bunch. Then "Todomatsu and the Five Demons" establishes him as a spiteful Social Climber and Bitch in Sheep's Clothing and this more or less sticks as his default persona from then on, while his earlier traits are largely downplayed outside of merch.
    • The first couple of episodes portray Todomatsu as a rather successful flirt who has no problems socializing with the opposite sex. As the series leaned more into him being a Bitch in Sheep's Clothing, he started to devolve into being more of a Know-Nothing Know-It-All who thinks he's more trendy than he actually is.
  • Cat Smile: His default expression, which fits with how he tries to act cute and innocent but is actually very conniving.
  • Chick Magnet: Played with. He's very good at befriending women (likely due to his Camp Straight nature), but has never been able to successfully land a date with one.
    • In "Star of Hope Todomatsu", he loses his usual charisma and becomes a shy, mumbling weirdo when attending a mixer, calling his actual skills with women into question. The season 2 skit "Osomatsu & Todomatsu" shows him to be able to hold a conversation with two women at another mixer quite well, however, suggesting that his poor performance in "Star of Hope" may have simply been a result of the events of the segment throwing him off his game.
  • Cower Power: He hides behind his older brothers whenever he's scared.
  • The Dandy: Aspires to present himself as a trendy metrosexual, and to his credit manages to pull it off to at least a certain extent.
  • The Face: He's pretty much the only one of the Matsuno brothers with an active and healthy adult social life and, as noted in Bitch in Sheep's Clothing above, he's good at manipulation and can bargain/reason with others (like he does with Hatabou to get a job) fairly well.
  • Failure Is the Only Option: As much as he wants to get out of the social pit he's in or get women, he just can't. Either it's because his brothers drag him down at every turn, or, provided they're not there, he just ends up unintentionally sabotaging himself.
  • The Fake Cutie: A rare male example. He acts cute and innocent to attract women, but he's every bit as dickish as his older brothers, if not even more so.
  • Fetish: He tells people it's legs, but in "Todomatsu's Line" he reveals that it's actually belly button wrinkles. Everyone is understandably alarmed.
    Todomatsu: More perverted than you thought, right?
  • Flanderization: Spin-off materials tend to exagerrate his Camp Straight tendencies to Wholesome Crossdresser levels, to the point where there's a high chance that any sort of merchandise involving themed costumes will feature Todomatsu in drag. In contrast, he hardly dresses as a woman any more than the other sextuplets do within the series itself.
    • By the second and third seasons, Todomatsu's dry personality has dominated his character. He will occasionally get moments where he's revealed to like his brothers deep down, but he gets mean to the point where his Literal Metaphor body physiology reveals he has no heart.
  • The Friend No One Likes: By the second season, Totty seems to have found himself replacing Karamatsu as the lowest brother on the totem pole. His Bitch in Sheep's Clothing shtick finally comes back to bite him where, in the finale to the first cour, the other five brothers actually get him kicked off the show and replaced. This crops back up again in the Valentine's Day skit where, when they resort to giving each other chocolate, none of them give any to Totty.
  • Girly Run: Many of the opening sequences show him to hold his arms higher up and closer to his chest while running than his brothers do, befitting his status as The Dandy.
  • Half the Man He Used to Be: Becomes this in his zombie form during "Christmas Osomatsu-san".
  • Hidden Depths:
    • In "Todomatsu's Line", he's hinted to be quite sporty. He frequently jogs, takes yoga classes, and climbed Mount Fuji all by himself.
    • "The Star of Hope, Todomatsu" brings to light some of his more sympathetic traits. While he firmly believes that none of his brothers have any chance of escaping their NEETdom, he wants to pull each of them out of it once he himself does. For all his disdain towards his brothers, he genuinely does want all of them to have better lives.
    • The ending "Osomatsu & Todomatsu" suggests that his constant failures to escape his NEET status despite his best efforts to, coupled with his brothers' increasing hostility towards him, has resulted in him developing self-esteem issues.
  • In-Series Nickname: "Totty", a nickname he acquired while he was working at Sutabaa.
  • In Touch with His Feminine Side: He does have the most feminine characteristics of the brothers, and sometimes tends to do things that girls would be noted to do (e.g. during the "Bathhouse Quiz" segment of Episode 3, he's notably the only one of his brothers to cover his chest the entire time). To further drive it home, his associated color is pink. This is exaggerated during "Osomatsu-kun Returns", where he's characterized as being so effeminate that Totoko just concludes he turned into a girl. Ichimatsu accuses him of intentionally doing this to make himself appear cuter, which is supported by the occasions where he freaks out and drops his usual girlishness.
  • Informed Attractiveness: Brought up but then immediately shot down. Todomatsu somehow believes that he's more attractive than his brothers, despite them being identical save for minimal differences, but Ichimatsu points out that he isn't better looking, just sly.
  • Irony: He may be the most feminine out of the brothers physically, but he's probably one of the most masculine emotionally. He sticks to his convictions, openly tries to flirt with and date girls, and is aggressive (even passively) and competitive.
  • Laser-Guided Karma: Totty, you really shouldn't tell your brothers that you're embarrassed to be seen with them, and then have them figure out you'd been lying about your life for the past couple of weeks. Things will not end up well for you.
  • Literal Metaphor: His innards show that the guy is literally heartless. It's amazing he can even breathe at all.
  • Living a Double Life: Todomatsu is very secretive about his social life. He's adaptive, builds connections with other people, and even gets a job once. Ultimately, he's given flak for it when his brothers find out about it.
  • Long-Range Fighter: Functions as this in the Tower Defense game Hesokuri Wars, albeit slightly closer in range and faster in walking speed than Ichimatsu.
  • Mock Millionaire: Character descriptions often note that he pretends to be posh and trendy to hide the fact that he’s just a low-class NEET, and "Todomatsu and the Five Demons" reveals that he spent several weeks pretending to be a student from Keio, one of the most prestigious universities in the country, just to impress the female baristas at Sutabaa.
  • Narcissist: While not quite as pronounced as Karamatsu, Todomatsu's intense vanity is still one of his most defining traits.
  • Nice Hat: Part of his alternate outfit. It can either be a straw hat with a pink ribbon lining the middle, or a reddish-brown beanie.
  • Normal Fish in a Tiny Pond: He's really only the social butterfly that he thinks he is in comparison to his brothers, which is about as low of a bar as you can get.
  • Not So Above It All: The "Star of Hope, Todomatsu" revolves around him going to a mixer and not wanting to bring any of his brothers with him, out of fear that they'll embarrass him by acting weird and antisocial. At the end of the episode, when he attends the mixer with Atsushi, a handsome and successful friend, he's shown acting weird and antisocial, causing him to get completely ignored by the women as a result. This shows that his sociability and charisma are only impressive in comparison to his brothers, and that he's still a cowardly NEET underneath all of his supposed charm.
    • The season 2 skit "Osomatsu and Todomatsu", however, has Todomatsu actually being quite smooth at a mixer, charming the girls with compliments and being overall a fine conversationalist. Even Osomatsu, who is to blame for all of Todomatsu's efforts in this skit being for nothing, is surprised at the latter's skills. Whether this suggests that Todomatsu was still brooding over the simulations with his brothers and ended up being outshined by Atsushi during the "Star of Hope" mixer, or if it's a case of Character Development on his part, is unclear.
    • During a particularly lazy afternoon in one segment, he cheerfully admits to Osomatsu that he agrees with his desire to continue riding out his NEETdom for as long as life will allow him to.
    • In Season 3's "The Way Home", Todomatsu mistakes a pretty cashier's friendly customer service for genuine romantic interest, subsequently falls in love with her, and gets promptly rejected. What's more surprising is the fact that Osomatsu and Jyushimatsu, arguably the least intelligent of the sextuplets, were able to tell the difference between true love and obligatory kindness.
  • Only Sane Man: Tends to play this role the second most frequently after Choromatsu. From a certain perspective, he fits it even better than Choromatsu does, as while Choromatsu is generally all-talk-no-action when it comes to escaping his NEET status, Todomatsu is quite proactive; maintaining a sizable social circle outside of the main cast and at one point working an actual job without having to be forced into it.
  • OOC Is Serious Business: He's a self-admitted coward and outright states that he won't fight battles he might not win, but the events of "Letter" manage to upset him so much that he breaks his own rule by picking a fight with Osomatsu, who is much stronger than him.
  • Parasol of Prettiness: Presumably to highlight his feminine side. Even though he's a guy, he carries one indoors while in his F6 form in "Osomatsu-kun Returns" and again in during the baseball match in the finale.
  • Pink Means Feminine: Pink is his signature color, and he is quite girly.
  • Pride: Part of his Bitch in Sheep's Clothing shtick. "Todomatsu and the Five Demons" establishes that his Social Climber trait stems from thinking he's better than his older brothers and "Accident?" reveals that he's also rather vain, as he declares himself the most attractive Matsu and then blows a fuse when Ichimatsu informs him that he isn't particularly good looking.
  • Recursive Crossdressing: The Osamu Tezuka collaboration has him dressed in Princess Sapphire's clothes, making him a boy crossdressing as a Sweet Polly Oliver.
  • Sissy Villain: A light example, but he's the most mean-spirited and conniving of the brothers as well as the most effeminate.
  • Smug Snake: Pretty clearly thinks of himself as above his brothers, and enjoys passive-aggressively rubbing it in whenever he can, but is just as quick as they are to devolve in to petty patheticness.
  • Social Climber: His main goal in some segments. To get by in modern society and get girls, he tries as much as possible to distance himself from his brothers and make himself out to be something he's not. However, even though he wants to graduate from his NEET status, he isn't entirely unhappy with just staying as one.
  • Straight Man: Takes on this role when Choromatsu can't keep it up. He's also usually the one to react to Karamatsu's questionable clothing choices due to his nature as the most fashion-savvy of the brothers.
  • Token Evil Teammate: Has shades of this. While the group as a whole is hard to sympathize with most of the time, Todomatsu's nasty streak is considerably crueler than his brothers' are.
  • Used to Be a Sweet Kid: The Movie reveals that he generally was as cute and innocent as he tries to appear to be during the brothers' school days.
  • What Measure Is a Non-Human?: Consistently refers to the family's new Do Anything Robots in season 3 as "machines" and "useful tools" compared to his brothers treating them more or less like living things. While perfectly in character, his brothers are still disturbed by his casual callousness.
  • Wholesome Crossdresser: When promotional materials and Hesokuri Wars have the opportunity to dress the brothers up in different costumes, they usually won't hesitate to draw Todomatsu in feminine/girl's clothes.
  • Youngest Child Wins: Played with. While he's only marginally younger than any of his brothers, both he and the rest of his family take his status as The Baby of the Bunch fairly seriously. And though he is consistently presented as the brother with the most drive and charisma needed to actually have a hope of making something of himself, he is also frequently shown to be the cruelest one of the bunch and to have a boatload of other personality flaws that make it hard to claim him to be in any way better than his siblings.

     Matsuyo Matsuno/Mom
Voiced by: Kujira (Japanese), Mick Wingert (English)

Mother of the sextuplets.

  • Abusive Parents: Slices off the nipples of four (it was going to be five, but Todomatsu chose to beat her to the punch and rip his own off) of her sons when they don't pick up on the fact that she wants them all to get jobs quickly enough. To be fair to her, they had pretty much brought it upon themselves by that point.
  • Alliterative Name: Matsuyo Matsuno. Also counts as Repetitive Name.
  • Beware the Nice Ones: Generally a sweet lady who is all too willing to forgive her sons' poor behavior. But when she's pushed too far, not even they're safe from her wrath.
  • Can't Stand Them, Can't Live Without Them: Despite knowing full well her sons are lazy, selfish NEETs, at the end of the day she loves them too much to get rid of them. In "NEET Correctional Facility", she agonizes over the idea of even sending one of the sextuplets away, and ultimately can't go through with it.
  • Childhood Friend Romance: She's been together with Matsuzo since middle school.
  • Happily Married: To Matsuzo, though they have a brief falling out in "Let's Become Independent".
  • Insult of Endearment: Lovingly refers to her sons as "My NEETS".
  • I Want Grandkids: Perhaps the strongest bargaining chip in the Matsuno arsenal once the brothers are old enough. When the subject is brought up in "Let's Become Independent", she loses her mind and tries to figure out which of the boys is the horniest of them all, and in the Mothers' Day chapter of the manga, she practically begs Totoko to marry one of them.
  • Only Known by Their Nickname: Her name never really comes up since everyone just calls her "Mom" or some variation thereof.
  • Pushover Parents: The sextuplets' selfish personalities are apparently the result of her spoiling them too much. While she does love her sons, Matsuyo regrets raising them the way she did.
  • Scary Shiny Glasses: Whenever she's really serious. "Hold it, you NEETs."
  • Took a Level in Badass: The second season presents her as having finally become fed up with her children's behavior, resulting in her being much more harsh and disciplinarian towards them.
  • Took a Level in Jerkass: The manga's version of her has far less tolerance for the boys' antics. To be fair, it's not without some reason. This has seemingly carried over into the anime's second season, where she is shown to be much less forgiving of her sons than she ever was in the first.
  • Tranquil Fury: Matsuyo tends to silently glare behind Scary Shiny Glasses when sufficiently pissed off.

     Matsuzo Matsuno/Dad
Voiced by: Kazuhiko Inoue

Father of the sextuplets.

  • Alliterative Name: Matsuzo Matsuno. Also counts as Repetitive Name.
  • Bumbling Dad: While Matsuyo has some power over her sons, Matsuzo sure doesn't. The sextuplets have very little respect for him and one volume of the manga adaptation even features them bullying him into submission when he tries to pull rank.
  • Can't Stand Them, Can't Live Without Them: Just like his wife, he doesn't want the boys to mooch off of them forever and wants them to get a job, but he's just too attached to them to make a real push.
  • Childhood Friend Romance: He's been together with Matsuyo since middle school.
  • A Day in the Limelight: Season two's episode "Matsuzo and Matsuyo" is one for him as he worries about his relationship with Matsuyo and his attempts to recapture the spark between them as the Sextuplets help him.
  • Dead Sparks: "Matsuzo and Matsuyo" focuses on his attempts at reviving the romance in his marriage.
  • Demoted to Extra: The biggest victim of this. While he didn't do anything particularly major in the original series, he was still a regular presence and one of the more notable supporting characters. In -San, the number of appearances he makes is less than ten. Presumably he's at work most of the time in order to support his family.
  • The Dog Bites Back: Laughs out loud at his sons right in front of them for being virgins in Season 2's Episode 4.
  • Happily Married: To Matsuyo, though they have a brief falling out in "Let's Become Independent".
  • Near-Death Experience: In episode 24 of Season 2, Matsuzo has a heart attack and gets admitted into the hospital. He survives, but the sextuplets take it badly.
  • No Respect Guy: All of his attempts at bonding with his sons end with him getting either ignored or bullied by them.
  • Only Known by Their Nickname: The only time you really see his name is on the divorce papers in "Let's Become Independent". Other than that, it's "Dad" the whole series.
  • Only Sane Man: He's the most levelheaded member of the family and is the only person who's baffled by "Osomatsu-san, As It Was" undoing everything that happened in "Letter".
  • Took a Level in Badass: In "Congratulations! Employment!" he displays far more of a backbone than he previously has when chastising his sons about getting jobs, showing none of his usual fear or reluctance in confronting them. This trend continues throughout season 2, where he is consistently shown to put up with his sons' shit far less than he had in the past.
  • What, Exactly, Is His Job?: He's some kind of office worker, but that's about all we know. One segment has some of his sons follow him to work to see just what his job is, only to be baffled to discover that his work day consists of performing various random and pointless tasks such as putting on a wig and then immediately taking it off. Whatever his job is, he's apparently quite good at it, since he lands two promotions in a single day.


Secondary Characters


Voiced by: Kenichi Suzumura (Japanese), Keith Silverstein (English)
Portrayed by: Mitsu Murata

The same old con artist who still claims to be from France. Iyami resents how he's no longer the Breakout Character he used to be, and sometimes tries to get back into the spotlight with little success.

  • Accidental Misnaming: The only character who still can't tell the sextuplets apart even after their extensive Divergent Character Evolution, not that he particularly cares. May overlap with Malicious Misnaming, as he acknowledges that the brothers have each developed unique character traits, suggesting that he still hasn't bothered to learn their names out of spite.
  • The Artifact: Played for laughs. He used to be the Breakout Character of Osomatsu-kun, but his hammy gag-based comedy has aged horribly over time, and is generally totally out of place in this series. His refusal to accept this has become a defining part of his character. "Iyami-san Is Troubled" has him finally acknowledge his status as this, causing him to fall into a state of depression so severe that he tries to hang himself.
  • Attempted Suicide: "Iyami-san Is Troubled" begins with him tying a noose and preparing to hang himself out of depression caused by his realization of his status as The Artifact. The remainder of the skit has Osomatsu and Chibita attempting to talk him out of it.
  • Attractive Bent-Gender: Taken to ridiculous extremes in "Iyami and Chibita's Rental Girlfriend", where his female form (a curvy blonde with Gag Boobs) is so gorgeous that she looks nothing like her original form.
  • Bad Boss: He becomes this to the Matsunos in "Let's Get a Job", in which he tricks them all into working for a "Black Factory" nonstop, with little to no breaks or pay.
  • Born Unlucky: Nothing ever goes his way.
  • Butt-Monkey: One of the most frequent victims to the Matsuno siblings' actions.
  • Catchphrase: He's still got "Sheeeeeh!" going for him. In fact, by his own self admission, that's barely all he has left going for him.
  • Character Exaggeration: While he's still an arrogant con artist, his "Sheeeeh!" ended up taking up so much of his character that even he admits that's his most standout trait.
  • The Chosen One: "Final Sheeeh" reveals him to be the only person in the world capable of using the "Sheeeh Fist", which is the most powerful martial art in existence. Of course, since the episode ends with his "Sheeeh" destroying the planet... this probably isn't canon.
  • Close-Range Combatant: Functions as this in the Tower Defense game Hesokuri Wars.
  • Crazy Homeless People:
    • He has no job at all from episode 3 onward, thanks to the brothers taking all his possessions while "trick-or-treating". He even gets into a fight with some vermin over a single piece of oden when he was starving.
    • "Chibita's Revenge" reveals that he somehow reacquired his house, but also shows that it's almost completely devoid of any possessions, suggesting that, while he's recovered from being homeless he's still treading dangerously close to the poverty line.
  • Crouching Moron, Hidden Badass: He's capable of mustering up an astounding work ethic when he puts his mind to something. Unfortunately, that "something" is almost never anything good.
  • Deadly Doctor: The "Persimmons" segment casts him as a doctor who actively tries to kill his patients.
  • Determinator: In "Iyami's Counterattack", he's willing to do absolutely everything to make himself the new main character, including putting his brain inside of a robot body and exterminating the entire human race.
  • The Dog Bites Back: While Iyami is generally relegated to the role of Straw Loser to the sextuplets, he's also occasionally allowed to have the last laugh over them.
  • Driven to Suicide: When he finally recognizes himself as a has-been with no place in the current incarnation of the series, his first instinct is to try and hang himself.
  • Fauxreigner: Even after all these years he still claims to have come from France, but the narration in "Iyami's Great Discovery" makes it clear that he's never been there. It seems he doesn't even know where France is or what it looks like, as the one photo where he claims he went there for a holiday shows the Trump Tower. In "Iyami-san is Troubled" he lampshades how his obsession with France is another factor that makes him The Artifact since nobody idolizes France that much anymore.
  • Foil: To the sextuplets. While all of the brothers, even Osomatsu, show some degree of guilt and anxiety over their inability to grow up and become functioning members of society, Iyami would rather become homeless than have to work hard for a living, and doesn't show even an ounce of shame for doing so. On the flipside, the season 3 opener shows that he's perfectly willing to give up everything that makes his comedic identity unique for the sake of money while the sextuplets aren't (though mostly because they can't).
  • Friendly Enemy: Reluctantly plays this role in most of the episodes he appears in, though it's mainly because the sextuplets bully him into helping them.
  • Gonk: He looks like a walking caricature with his buck teeth, narrow eyes and goofy haircut and mustache.
  • Glory Days: After his explosive popularity pre-San faded away, he's nothing short of bitter about his star power fading and often likes to talk about how popular he was back then.
  • Green-Eyed Monster: While he's always hated the Matsuno brothers, his contempt is now mostly the result of his resentment of them overshadowing him as a character, whereas it was previously the other way around.
  • Hotter and Sexier: He gets such a form during the F6 stunt in "Osomatsu-kun Returns", becoming a blonde haired, blue eyed Bishounen. His female form in "Iyami and Chibita's Rental Girlfriend" is a blonde, busty bombshell compared to his Gonkish normal look.
  • Inferiority Superiority Complex: Acts haughty and arrogant but is all too painfully aware that he's become a washed up nobody. When forced to confront the reality of his situation, he becomes so depressed that he tries to kill himself.
  • Jaded Washout: Incredibly bitter about no longer being the comedy icon he was during the Showa era, and regularly critiques the comedic stylings of the Matsunos, particularly in the "Iyami's School" segment.
  • Jerkass: A mean-spirited, self-absorbed wannabe conman. Despite this, he's just so pathetic that you still have to feel kind of sorry for him.
  • Lazy Bum: He's only willing to work hard if the reward for doing so is vast wealth and/or fame. Otherwise, he'd rather be homeless than have to make an honest living.
  • Lightning Bruiser: Functions as this in the Tower Defense game Hesokuri Wars.
  • Menace Decay: While he's still occasionally able to pull off cons, he's much more likely to be bullied into submission by the Matsunos whenever he appears than in previous iterations.
  • Meta Guy: By virtue of becoming The Artifact, many of his A Day in the Limelight segments tend to be very self-aware.
  • Miles Gloriosus: Considers himself to be a refined man of culture when in reality he's close to being a Crazy Homeless Person.
  • Out of Focus: Formerly the Breakout Character of the Showa era, currently a side character that the director admits to having no idea what to do with. It reaches a point where his status as a relic that has no real potential in the current age has become his defining character trait.
  • Perpetual Poverty: He's always struggling to get by, since he's too lazy to work a regular job and his schemes almost always fail.
  • Pet the Dog:
    • "The Letter" has him help Choromatsu move out of the house. While he initially openly scoffs at the idea of any of the sextuplets actually growing up and maturing as people, mockingly stating that they'll be back to being NEETs before they know it, he shuts up when he sees Choromatsu crying over his words.
    • "Iyami, Alone in the Wind" has him work himself to the point of exhaustion and willingly serve out several years in jail for the sake of allowing a blind little girl the chance to be able to see. When he's finally released, he cries uncontrollable Tears of Joy at the sight of her as a happy, no longer blind adult.
  • Phenotype Stereotype: While this series confirms that he's never even been to France, both his Bishounen form and Iyayo appear with blonde hair, although Iyayo has brown eyes.
  • Sanity Ball: While Iyami is primarily characterized as a ridiculous Schemer, he has a surprisingly high tendency of playing the role of Only Sane Man to the rest of the cast. Likely linked to his status as The Artifact, as, while it's difficult to incorporate his rather dated comedic stylings into contemporary plots, it's comparatively easy to have him play Straight Man to the Matsuno brothers, who have all gotten much more eccentric.
  • Schemer: Iyami still regularly engages in get-rich-quick schemes, and even occasionally manages to get his old partner in crime Chibita out of retirement to help him with them.
  • Sitcom Arch-Nemesis: Almost all of his interactions with the sextuplets are hostile, but they're always Played for Laughs.
  • Smug Snake: Cocky and egotistical despite having no skills beyond his "Sheeeeeh!".
  • Spotlight-Stealing Squad: This gets to his head in episode 18, where he references his becoming the main character back in -Kun and decides to hold a death race so he can take back the limelight.
  • Straight Man: He gets to be this in the "Totoko's Dream" segment of episode 8, since all of the Matsuno brothers are currently fawning over Totoko. In general, if he's not the one behind the wackiness, he's the one pointing it out.
  • Straw Loser: The only person capable of making the Matsunos look like winners in comparison, though even that sometimes varies.
  • Vague Age: Just like in the past, he is still "older" than the sextuplets, who are now roughly estimated to be in their early twenties.
  • White-Dwarf Starlet: Is this in a meta sense. By "Iyami's Great Discovery", he can't convince a temp agency that he was a famed comedian during the 60's and 80's, and by "Iyami's Counterattack" he outright tries to murder the rest of the cast in order to take back his fame.


Voiced by: Sachi Kokuryu (Japanese), Alejandra E. Cazares (English)
Portrayed by: Kimeru

The Matsuno brothers' former childhood rival, who now runs an oden stand. He's mellowed out considerably over the years and doesn't antagonize the brothers as much, though he still gets on their case about not paying their tab.

  • Adaptational Nice Guy: He's much nicer, more reliable and less of a brat than he was during the -Kun days. Justified in that -San is intended to be set several years after -Kun and in that time he's managed to grow up and mature into a better person, unlike everyone else.
  • Attractive Bent-Gender: When Iyami convinces him to join in on the rental girlfriend gig, Chibita doesn't actually look too bad in girl's clothing. But when Dekapan gives him a gender bending drug, his female form is this Up to Eleven, with bigger eyes, a cuter figure, and Mega Twintails.
  • The Bartender: Plays this role despite owning an oden stall instead of a bar (though he does serve alcohol along with oden). When he's not scolding the sextuplets for not paying their tab, he's handing out aggressive but well-meaning advice; "Chibita and Oden" establishes that he's genuinely concerned about where their lives are headed.
  • Berserk Button: Not paying your tab or insulting his oden are good ways of pissing him off, but he's generally quick to forgive people for doing them. If you value your life, though... don't even think about pulling out his one and only hair.
  • Beware the Nice Ones: Chibita's an affable guy as long as you pay your bar tab. Even then, he's quick to forgive and forget. But whatever you do, for the love of god, don't ever mess with his one and only hair.
  • Determinator: "Chibita's Revenge" reveals that, when sufficiently pissed off by them, he'll stop at nothing to put the Matsus in a world of hurt.
  • Driven to Suicide: The movie shows that when the Matsunos were in high school, Chibita was trying and failing to make it as a chef that he was considering suicide.
  • Green-Eyed Monster: He reveals to Osomatsu that the main reason why he liked to pick on the Matsuno brothers as a kid was because, being an only child, he was jealous of the bond they shared.
  • Hard Head: "Chibita's Revenge" reveals that he has one. His head is hard enough that he can render someone unconscious just by headbutting them, and when Choromatsu and Jyushimatsu throw everything they can at him (even firing a rocket launcher!) to slow him down while he's chasing them, he comes out completely unscathed.
  • Heterosexual Life-Partners:
    • Has shades of this with Karamatsu, due to being the only character who seems to consistently like and care about him. They even become roommates after Karamatsu moves out in "The Letter".
    • Averted with Iyami, as while they're still friends, they're no longer the inseparable con men buds that they were in the past.
  • Hidden Badass: Chibita is generally a fairly affable guy, but get on his bad side and he'll reveal himself to be an unstoppable force of nature comparable to the scariest slasher movie villain.
  • Hot-Blooded: Especially when he's making oden.
  • Intergenerational Friendship: He's still friends with Iyami, who's at least a decade older than him, though they're not as close as they were in -Kun.
  • Interspecies Romance: A brief one with a flower sprite, who played the part of a Manic Pixie Dream Girl to stop him from obsessing about oden. The basic premise of this happened in -Kun, too.
  • Jerk with a Heart of Gold: He rarely shows any animosity for the sextuplets aside from wanting them to pay their tab. He will resort to some pretty odd ways of getting back at them, though.
  • Nice Guy: While not a complete walkover, Chibita is overall a reliable and friendly guy.
  • Not So Above It All:
    • Even though he's generally more put together than the Matsunos are as adults, he can get downright silly at times. "Chibita and Oden" showcased his absurd passion for all things oden, and "Iyami and Chibita's Rental Girlfriend" had him join in on the opportunity to rob the Matsunos blind of their money.
    • "Chibita's Revenge" has him go on a murderous rampage after the brothers for pulling out his only hair, with his justification for doing so that they made him go bald. The brothers point out that he already basically was bald besides the single hair.
  • Older Than He Looks: Despite his short stature and boyish-sounding voice, he's just as old as the Matsuno siblings.
  • Only Friend: With Totoko, Hatabou, Dekapan and Dayon often being closer to Fair Weather Friends to the sextuplets and Iyami more or less being their Sitcom Arch-Nemesis, Chibita is the only real friend they have outside of themselves.
  • Only Known by Their Nickname: "Estimated Value" suggests that "Chibita" is actually a nickname that the sextuplets gave him, as he is shocked and offended to learn that it has derogatory connotations.
  • Only Sane Man: Between his childhood neighbors becoming manchildren (plus one womanchild), his old friend becoming a Crazy Homeless Person obsessed with his former popularity, and his other childhood acquaintance becoming a billionaire megalomaniac, he's quite noticeably the only cast member with a stable job, a place to stay, and not many worries in his life besides obsessing over oden.
  • Out of Focus: While he still has some prominence as The Bartender, his days of being the series' secondary Breakout Character after Iyami are long behind him. Unlike Iyami, he seems to be more or less fine with this.
  • Rage-Breaking Point: Though he's often frustrated with the Matsuno brothers never paying their tab, he usually forgives them, especially when they compliment his oden. However, his only hair getting pulled out in "Chibita's Revenge" is the last straw for him, and this prompts him to take violent revenge.
  • Serious Business:
    • Anything involving oden. In "Chibita and Oden", he tells Karamatsu about the importance of oden throughout the years and how to make what he called "the best oden in the world".
    • In "Chibita's Revenge", he utterly loses it when a scuffle with the Matsuno brothers causes the only hair on his head to be pulled out, and from there he enacts a violent revenge scheme against them.
  • Signature Laugh: "Kekeh!"
  • Sir Swears Alot: Punctuates his sentences with "idjits", "damn it" or "bastard".
  • Supreme Chef: His oden is apparently excellent, and he has dedicated his life to making it taste even better. "Estimated Value" has his cooking evaluated on a global scale by two robots, and it manages to score a very respectable 86 out of 100.
  • Token Good Teammate: While the sextuplets, Totoko and Iyami are all varying degrees of Jerkasses and Hatabou, Dekapan and Dayon are prone to being Bitches in Sheeps Clothing, Chibita is consistently portrayed as a reliable, friendly guy.
  • Took a Level in Kindness: He's a lot less of a trickster here than he was in -Kun, and is generally presented as being the closest thing the brothers have to a real friend.
  • Trademark Favorite Food: Oden, just like in -Kun. As an adult, he now runs an oden stand.
  • Verbal Tic: He frequently ends his sentences with "you idjits" or "damn it", or sometimes with both.

     Totoko Yowai

Voiced by: Aya Endo (Japanese), Cassandra Lee Morris (English)
Portrayed by: Ran Sakai

The girl who the Matsuno brothers have been crushing on since childhood, despite how she very obviously doesn't want to date any of them. She strives to be an Idol Singer in order to gain popularity.

  • Advertised Extra: Despite appearing on a fair number of official promotional images (about as much as Iyami), and despite all the segments and stories she got in -Kun, she's the member of the supporting cast Demoted to Extra the hardest in -San. Over the first cour, she appears in less than half the episodes (one of which is a Clip Show) and even in the episodes she's in she doesn't get terribly much screentime. Case in point, "This Is Totoko", the episode that formally introduces her, has her onscreen for about four minutes.
    • Lampshaded in episode eighteen, where she goes on a bloody rampage trying to kill the brothers so that she can win the protagonist role and get more screen-time.
  • Animal Motifs: Fish. Her parents run a fish market, her name literally means "fish child", and her idol costume even appears to be made out of fish.
  • Attention Whore: She really seems to like when all the focus is on her. Case in point, her idol stunt was just so she could brag about her popularity to everyone.
  • Ax-Crazy: Prone to random outbursts of ultra-violence. One notable instance is in episode 5 of season 2, where she ends up nuking an entire beach just because she doesn't like seeing couples having fun during summer.
  • Big Eater: Manages to totally wipe the floor with her competition during a professional eating contest, even while being completely distracted by the brothers' antics.
  • Bitch in Sheep's Clothing: She may seem cute and sweet at first glance, but it's soon made apparent that she's actually very selfish, hungry for attention and quick to anger. This is especially prominent in episode 8 of season 1, where she makes a rather menacing face when angry, punches Karamatsu in the gut twice, and reveals that she wants to be an idol solely to get attention. The brothers continue to fawn over her anyway.
  • Broken Pedestal: Nyaa looked up to her when they were students, but looks down on her as an adult. Even after they become friends in season 3 it's made clear that Nyaa doesn't have any respect for her.
  • Childhood Friends: With the Matsuno brothers. Makes you wonder how they stayed friends for so long.
  • Christmas Cake: It's implied that she's worried about becoming this, since in "Totoko's Big Panic" she becomes extremely jealous of her old schoolmates who are already married and have children, and she tries to find a rich boyfriend. "The Perfect Christmas" stealthily touches on this by introducing her while she's selling actual Christmas cakes and being upset nobody's buying them.
  • Closer to Earth: Averted. The only things that put her above the Matsuno brothers as a person are her looks and her determination to become a successful idol. Even then, her reasons for wanting to be an idol are entirely selfish and she tends to only ever make terrible career choices.
  • Cloud Cuckoolander: She can be pretty strange at times. She thought it was a good idea to use actual fish as the headpiece for her idol costume, and keeps a teddy bear with a knife sticking out of it in the corner of her room.
  • Decoy Protagonist: The F6 segment of Osomatsu-kun Returns positions her as the heroine of the Hotter and Sexier reboot, with the Matsus acting as her reverse harem. She ends up dying of a Nosebleed not long after meeting them, and is immediately reduced back to being a supporting character by the time she reappears in the actual series.
  • Distaff Counterpart: Of a different kind from the Girly-Matsus. Like the brothers, she's an emotionally-stunted unemployed young person with a rotten personality, and she often leads sketches that explore these circumstances from a female perspective.
  • Dude Magnet: She has the six Matsunos plus a few other weirdos all over her. Justified to a degree, as all of the men who are interested in her are clearly made out to be creepy bottom feeders on the lowest rung of society who will do anything to be with a pretty girl, which she takes full advantage of to exploit them for free labor.
  • Eating the Eye Candy: When Osomatsu and Jyushimatsu have their school jackets and dress shirts taken off and subsequently kiss each other in "Osomatsu-kun Returns", one can see Totoko clearly peeking her eye out while she's trying to cover her face from embarrassment.
  • Face of an Angel, Mind of a Demon: She's genuinely very cute, but that's the only positive quality she has going for her. Otherwise she's a shallow, violent and emotionally-stunted narcissist who demands that others treat her like royalty simply for being alive. It's even acknowledged in-universe when she has her personal qualities statistically evaluated by the Matsunos' robots in "Estimated Value": scoring a 96 out of 100 for her looks, a 2 out of 100 for her talents as an idol, and a Shit out of 100 for her personality.
  • Failure Is the Only Option: Her idol career is doomed to go nowhere, with her shows rarely getting crowds larger than the single digits even with the Matsuno brothers as her toadying fanboys.
  • The Fake Cutie:
    • Despite being an adult, she still tries to come across as cute and childish, and in reality she's self-absorbed and just as petty as the Matsuno brothers. "Totoko's Big Panic" emphasizes how her cute looks are really all she has going for her, and even that won't last much longer now that she's an adult.
    • The movie shows that in high school she pretended to be perfect as the heroine of the series but it was incredibly stressful being someone that she wasn't that she would hit her head against rocks in frustration.
  • Flanderization: Totoko's hidden mean streak existed even back in Osomatsu-kun, but it's made into her defining character trait here to emphasize her status as a Womanchild and Foil to the Matsuno brothers.
  • Future Loser: Was the School Idol back in high school and worshiped by the people around her for being a seemingly flawless, beautiful girl. As an adult, she's unemployed, hasn't amounted to anything, and is only popular among skeevy losers even more pathetic than she is.
  • Girly Bruiser: Incredibly girly, to the point of childishness, but also ridiculously violent.
  • Girlish Pigtails: She still has them as an adult, indicating that she hasn't really matured much.
  • Gold Digger: Her idea of a perfect man to marry is someone who's rich, namely an oil magnate. When she goes to a mixer in "Totoko's Big Panic", she's perfectly willing to hook up with a balding man and a fat man, but as soon as she finds out that neither of them are rich oil magnates she rejects them immediately.
  • Green-Eyed Monster:
    • Despite repeatedly stating that she has no interest in dating any of the Matsuno brothers, she'll still get angry when they pay more attention to other girls. In "Iyami and Chibita's Rental Girlfriend", she doesn't take it well when they ignore her new crustacean-themed idol outfit because they're more interested in Iyayo and Chibimi, and the New Year special has her reacting much the same when she finds out about them fawning over the barista girls from "Todomatsu and the Five Demons".
    • This is what drives her to seek a rich boyfriend and a new life in "Totoko's Big Panic." Her old school mates and even Nyaa Hashimoto have found men to settle down with, forcing Totoko to realize how she's not as popular or desirable as she thought. When she confronts her parents about this and how angry she is about it all, they bring up the possibility that she's envious and jealous of those around her. Amusingly, Totoko doesn't know what they're talking about.
  • Hates the Job, Loves the Limelight: Could not be a more literal version of this. In "Totoko's Dream", she reveals that she's not, in fact, working for more exposure for her parents' business, and she's only doing the idol stunt in order to amass legions of fanboys.
  • Heterosexual Life-Partners: Becomes this with Nyaa in Season 3, after discovering her status as a Struggling Single Mother and agreeing to take up a tag-team wrestling career with her to help support her new baby. They still fight each other.
  • Hot-Blooded: Tends to get thrown into fits of screaming rage pretty easily.
  • Hidden Depths: Season 2's "The Cutie Next Door" shows she is aware of her own selfishness, and that she does value the sextuplets' companionship (if only as a way to boost her ego and make them do things for her).
  • Idol Singer: In "This is Totoko", she says she wants to become one in order to bring in more money for her parents' fish market. However, it's shown that her parents clearly don't need more money (they get plenty of customers and they own a very expensive car), and in "Totoko's Dream" she admits that the real reason she became an idol was to get attention and popularity. In "Totoko's Big Panic", her idol career is revealed to not be taking off at all; aside from the Matsuno brothers, she only has about three or four people coming to her events. In "Estimated Value", the two robots even rate her skills as an idol at a pitiful 2 out of 100.
  • I Have Boobs, You Must Obey!:
    • A G-rated version of this, as she got multiple groups of men (including the Matsunos) to buy her ridiculously expensive merchandise and concert tickets to kick off her idol career. She also got Choromatsu to be her manager by giving him back pats.
    • A not-so-G-rated version happens in the last episode of Season 1, when Totoko tries to motivate the Matsunos to win the baseball tournament by stripping naked and saying she'll let them have sex with her if they beat the other team. They fail to win anyway.
  • It's All About Me: Completely self-absorbed, and only ever does anything if it makes other people fawn over her.
  • Jerkass: Even when she's acting cutesy, she's openly rude and spiteful to everyone she interacts with.
  • Loves My Alter Ego: Downplayed. Totoko from the "F6" skits is far more receptive to the Hotter and Sexier brothers' romantic advances compared to their beady-eyed counterparts. She still has her limits, though. See Not Distracted by the Sexy below.
  • Meaningful Name: The "toto" in her first name (とと) is a childish word for "fish", while her last name is a homophone for "sardine", which is fitting for the daughter of the owners of a fish shop.
  • Megaton Punch: Rather infamous for it among the brothers. It's also apparently strong enough to knock the oil magnate out of the Burj Khalifa.
  • Ms. Fanservice: Parodied. While she's occasionally shown in sexy outfits, these appearances are always juxtaposed with her acting even more horribly than she normally does, such as when she nukes an entire beach while wearing a skimpy bikini.
  • Narcissist: She's quick to boast about how cute she is and believes that she should be treated like royalty because of it. Whenever anyone starts to steal attention away from her, she'll immediately get jealous.
  • Non-Standard Character Design: Her design is much less exagerrated and more conventionally "cutesy" than any of the rest of the main cast. While this is a holdover from her Osomatsu-kun days, it is also incorporated into her characterization as a shallow narcissist with the looks needed to fit in with "proper" society but none of the personality.
  • Nosebleed:
    • After she was forced to choose between the Hotter and Sexier version of the sextuplets in "Osomatsu-kun Returns", she had such a big one that she died from it. Played for Laughs, of course.
    • She does it three more times during her segment in "Christmas Osomatsu-san", after the boys start treating her to things.
    • She gets one upon seeing Idol Ichimatsu naked in "Iyami's Counterattack".
  • Not Distracted by the Sexy: She's finally able to handle the hot idol versions of the sextuplets by "Iyami's Counterattack" without getting a nosebleed. Subverted when Ichimatsu gets naked and Iyami distracts her with a naked board of all six.
  • Pet the Dog:
    • Offers to go on a date with Osomatsu in "The Letter" in hopes it'll make him feel better after all of his brothers moved out of the house. Sadly, it doesn't work.
    • Though she's initially jealous of Kin-chan's friendly relationship with the Matsuno brothers in "The Cutie Next Door", she eventually gets over it after the situation is explained to her and even gives Kin-chan a huge fish as a gift.
    • She also gives Osomatsu support and advice in "Cherry Blossoms", simply because she noticed him looking lonely.
    • When Nyaa passes out in "Unit Formed", Totoko takes her inside and treats her until she wakes up.
    • When Osomatsu gets cold feet the night before his date with Nyaa in "Just Don't" Totoko gives him advice for his situation. While the audience doesn't hear it, whatever she said motivated Osomatsu to go through with it.
  • Pink Means Feminine: Wears a pink sweater and has a general affinity towards pink-colored things.
  • She's All Grown Up: She does fill out nicely in her adulthood, but it's offset by her miserable personality.
  • Ship Tease: Osomatsu seems to have the greatest luck among the brothers bringing out her softer side, with two of her biggest Pet the Dog moments, in the segments "The Letter" and "Cherry Blossoms", being directed at him.
  • Sibling Triangle: She's at the heart of it with the Matsuno siblings, even though she wants no part of it.
  • Small Name, Big Ego: Believes that she is above "commoners" and deserves to be treated like a queen despite being the daughter of fish mongers and having no skills beyond being cute, which "Totoko's Huge Panic" highlights won't last much longer now that she's a grown woman.
  • The Smurfette Principle: Following Matsuyo's case of Demoted to Extra, Totoko is the only major recurring female character.
  • Strong Family Resemblance: Her mother shares her hairstyle, minus the pigtails.
  • Tsundere: While she acts like she's above the Matsuno brothers most of the time and rejects them whenever they attempt to ask her out, she immediately becomes a Clingy Jealous Girl the second they show interest in someone other than her. Zig-zagged in that her jealousy is less born from a hidden attraction to any of the brothers then it is from her desire to be fawned over.
  • Vitriolic Best Buds: She and Nyaa become friends in Season 3, but that doesn't mean they argue any less.
  • What Does She See in Him?: She may be cute as a button, but she can be downright ungrateful to the Matsuno siblings sometimes and can be very shallow. Iyami is usually the one to comment on it when he's not enthralled by her as well.
  • Womanchild: When it comes down to it, she can be just as immature as the Matsuno brothers. She still tries to act as cute and sweet as she was when she was a kid, still lives with her parents, is extremely quick to anger when she isn't being paid enough attention, and apparently has no idea what envy and jealousy are despite being very much a Green-Eyed Monster towards various people.


Voiced by: Momoko Saito (Japanese), Cherami Leigh (English)
Portrayed by: Yuuya Hara

Once a childhood acquaintance of the Matsuno brothers and occasional minion of other characters, Hatabou appears to not have aged at all. However, he's surprisingly good at making money.

  • The Ace: Overwhelming success just sort of seems to fall into his lap. Season 2 heavily implies that he was previously a handsome pirate who changed his appearance and had his memories erased entirely because he had already attained everything he could ever want and had grown bored with his life.
  • Bitch in Sheep's Clothing: He's nice to others as long as they promise to be "friends" with him, but the moment that friendship is broken, he couldn't care less what happens to them afterwards.
  • Born Lucky: Can apparently become a multi-billionaire with legions of adoring servants by doing almost nothing.
  • Depending on the Writer: While the first season consistently portrayed him as being fabulously (and improbably) wealthy and successful, the second season tends to flip flop between him retaining his success and him being just as down on his luck as the rest of the cast.
  • Fiction 500: Hatabou has become an absurdly rich man who obtained his profits by trading information with the American government. He doesn't even care that Osomatsu wants to take one million or even one billion yen from him, as he can easily make it all back later.
  • Foil: While most of the rest of the cast are punished to remain social outcasts for their refusal to grow up and take on real responsibility, Hatabou is rewarded with vast wealth and success despite acting even more childish than they do.
  • Gag Penis: Revealed to have this in "Tidbits Collection", though he lacks it in all of his following naked appearances.
  • Gonk: Albeit in an Ugly Cute sort of way; his features are lopsided and look strangely flat.
  • Ill Boy: The "Persimmons" segment features him as a hospital patient with an undisclosed terminal illness. While he resigns himself to death, watching the final persimmon of a tree outside his window refuse to fall no matter what tries to knock it down inspires him to remain strong and keep on living.
  • In-Series Nickname: "Mr. Flag" when he strikes it rich.
  • Kavorka Man: Frequently surrounded by gorgeous women, despite looking like an ugly little kid. Justified, since he's filthy rich and they're most likely only interested in him for his money.
  • Manchild: Looks and acts about 4 years old, but is actually somewhere in his early twenties.
  • Mythology Gag: His clothes are based on the overalls he wore in the 1988 adaptation of -Kun.
  • Older Than He Looks: He's also an adult by the time of -San, but he's just as short and childish as he was when he was a boy. Season 2 implies that he's even older than we thought he was.
  • Retired Outlaw: Season 2 drops the suggestion he used to be a space pirate, hiding in Earth after radically changing his appearance after he got bored with his previous life.
  • Supreme Chef: After he loses all his money, he rebuilds his empire around his delicious cooking. Just don't ask about the meat...
  • Wearing a Flag on Your Head: Not only does he wear one, but everyone who works for him has to get one inserted into their heads (or otherwise).
  • Vague Age: He's "younger" than the Matsunos, and he still looks and acts like a kid when the sextuplets become adults. Season 2 suggests that he's even older than we thought he was.
  • Verbal Tic: Ends his sentences with "-dajo" or just "-jo".


Voiced by: Yoji Ueda (Japanese), Ray Chase (English)

Dekapan is mostly unchanged from his character in -kun, continuing with his role of making various inventions and keeping items in his large pants.


Voiced by: Nobuo Tobita (Japanese), Keith Silverstein (English)

Mostly the same character as he was in -kun, but this time around he tends to show bizarre behaviour and otherworldly abilities.

  • Ambiguously Bi: Shows explicit interest in women but is heavily implied to be more than just friends with Dekapan.
  • Ambiguously Evil: While he generally seems harmless - if weird - several segments suggest that he's far more malevolent than he lets on. Most notably, the sketch "Synthesis" features him tricking the entire population of the earth into fusing together into horrific monsters seemingly entirely for his own amusement. To be fair, however, he shows regret over his actions at the very end.
  • Ambiguously Human: Regularly defies the laws of reality despite appearing to be... more or less human.
  • Bigger on the Inside: "Dayon Tribe" reveals that he has an entire civilization living inside his ridiculously spacious belly.
  • Big Eater: Out of the entire cast, he's the one who's shown eating the most. He doesn't gain any weight from it, however.
  • Character Exaggeration: In -Kun, while Dayon was still a bit character, he was generally a normal person who just so happened to have a long face. In -San however, they kind of play him up more as a silly guy, and he ultimately comes off as one of the weirder side characters.
  • Comedic Sociopathy: Season 2 has him act as the "spectator" of one episode, and his only positive reactions come whenever any misfortune befalls the cast.
  • Cloudcuckoolander: Seemingly operates on a level completely beyond human comprehension.
  • Everyone Has Standards: He spends almost all of "Synthesis" fusing the other characters into strange and sometimes horrific beings for his own amusement, but he finally realizes he's gone too far when he fuses a huge amount of people into a piece of poop.
  • Gonk: While most of the main cast are somewhat strange-looking, Dayon manages to look downright disturbing at times.
  • Heterosexual Life-Partners: With Dekapan, to the point where the "Heterosexual" part is debatable. When asked by his doppelganger in "Dayon and Dayon" if he has a wife, he says no but immediately begins talking about Dekapan as if he were a valid substitute.
  • Humanoid Abomination: Character Exaggeration has made him into one. Apparently he has an entire civilization of people who look similar to him living inside of his stomach and thousands of clones of him are built every day in the Black Factory. Almost all of the opening sequences feature a titanic version of him for seemingly no reason other than creepiness.
  • Jerkass: While his upbeat and wacky demeanor conceals this somewhat, Dayon is generally a self-serving and unhelpful guy who frequently takes advantage of and abuses others, particularly Dekapan.
  • My God, What Have I Done?: After he succeeds in fusing the entire world together into terrible monsters seemingly without a hint of regret, he breaks into tears after the final fusion produces nothing more than a lump of poop.
  • OOC Is Serious Business: When he and Dekapan become obsessed with becoming the protagonists in episode 18, he drops his Verbal Tic and starts acting bloodlusted.
  • Pokémon Speak: He does this in appearances where he doesn't have a large role, and in the mostly silent skit "Going North".
  • Those Two Guys: With Dekapan.
  • Vacuum Mouth: His enormous mouth can inhale entire cityscapes.
  • Verbal Tic Name: He ends most of his sentences with either "-dayon" or "-yon".
  • Wholesome Cross Dresser: Generally wears a French maid outfit when helping out Dekapan at his lab.
  • With Friends Like These...: Does some pretty terrible things to Dekapan over the course of the series, including fusing him together with a fly against his will and stealing his pants, forcing him to run around completely naked, and refusing to give them back.

     Nyaa Hashimoto (Nyaa-chan)
Voiced by: Nanami Yamashita (Japanese), Cherami Leigh (English)

A cat-themed idol singer that Choromatsu is a fan of.

  • Advertised Extra: Presented as a major secondary character in many of the opening sequences, but is in fact a very minor one prior to Season 3.
  • All Girls Want Bad Boys: When Totoko and the rest of the sextuplets (minus Choromatsu) get her to see several of Osomatsu's negative traits in "Just Don't" when she begins to develop feelings for him, it just further strengthens her attraction to him. Later subverted as when she wakes up the next day, she realizes that Osomatsu wouldn't be the right partner for her, so she cancels their date.
  • Always Someone Better: After their relationship is first established in "Totoko's Huge Panic'', and before her own status as a Struggling Single Mother revealed, most of Nyaa's screentime is devoted to showing her one-upping Totoko.
  • Animal-Eared Headband: She's almost always seen wearing fake cat ears (along with a fake tail and fake cat paws) to go with her Cat Girl shtick as an idol.
  • Ascended Extra: This is done gradually. She makes only a few appearances in Season 1, while in Season 2 she mainly appears alongside Totoko as her Satellite Character rival. Season 3 gives her Hidden Depths that flesh her out beyond her relationship with Totoko and features her in nearly every episode, effectively making her a full-fledged member of the show's supporting cast.
  • Ascended Fangirl: The movie reveals that she used to idolize Totoko during their childhood, but then Nyaa became an idol and became far more popular than her.
  • Bitch in Sheep's Clothing: Despite her friendly appearance, "Totoko's Huge Panic" shows her being rather passive aggressive toward Totoko and she doesn't hold back an extremely smug look on her face when she introduces her extremely rich and handsome fiancé. Too bad the marriage doesn't last.
  • Breakout Character: Essentially a Bit Character during her first appearance, positive reception to her cute design has led her to get prominently featured in advertising and merchandise, along with an increase in screentime. By Season 3, she's firmly established as a recurring character.
  • Broken Ace: Season 3 reveals that she is divorced from her husband and raising a baby on her own, and while she's significantly more popular as an idol than Totoko is, even she admits that she's far from anywhere close to actually being a successful idol.
  • Cat Girl: Her gimmick as an idol, since she wears fake cat ears with a matching tail and paw gloves, and all of her songs are cat-themed. She still dons a cat-themed outfit when working as a wrestler.
  • Characterization Marches On: Much like Todomatsu before her, Nyaa's character has largely become defined by her two-faced personality and love for smugly one-upping Totoko, despite both traits only being revealed during her final major appearance in season 1. Considering that she essentially had no character besides "cat-themed idol that Choromatsu likes" at first, it's actually fleshed her character out a lot. She receives further characterization in Season 3, making her the biggest example of an Ascended Extra in the series.
  • Color Failure: Experiences this when Osomatsu bluntly asks her to have sex with Choromatsu.
    • She induces this on five people when she agrees to date that very blunt person more than two-and-a-half seasons later. Not even the lucky guy is able to accept this.
    • A further three episodes down the road sees her (or him) experiencing yet another one, when it's revealed her (or his) love interest is only after the money. The color comes back when the love interest in concern expresses satisfaction.
  • Everyone Went to School Together: The movie shows that Nyaa and Totoko knew each other when they were in school with Nyaa looking up to Totoko.
  • Foil: To Totoko. While both of them are two-faced idols, Nyaa is shown to take her career seriously and put the work in to improve her popularity, lives independently, and, by season 3, is raising a child on her own. In contrast, Totoko is a Womanchild who still lives with her parents and only works as an idol to be fawned over.
  • Heterosexual Life-Partners: Becomes this with Tokoto in Season 3, after Totoko learns about her status as a Struggling Single Mother and agrees to take up a tag-team wrestling career with her to help support her new baby. They still fight each other.
  • Hidden Depths:
    • It's hinted in "Totoko and Nyaa 2" that she's actually a very lonely person despite being a popular idol. When she uploads a picture of some oden she's eating to Instagramatsu, she adds hashtags like "#DrinkingByMyself", "#Suffering" and "#I'mReallyLonely".
    • The episode "Unit Formed" shows that she's secretly heavily exhausted working as an idol and struggles to get by, but continues to work to provide for her baby. This arguably makes the Hashtag gag Harsher in Hindsight.
  • Horrible Judge of Character: Her crush on Osomatsu heavily implies that she is easily attracted to people with bad personalities, which possibly explains why her marriage ended in failure, with her husband leaving their child to her care.
    • She (or he) still suffers from this in AU spin-offs. As the prince, he falls in love with Totoko (as Cinderella), but this love interest not only criticizes him for showing off, but also tricks him into giving her everything before dumping him and running away.
  • Jerkass: Towards Totoko, in a passive-aggressive way. Not only does she smugly rub the fact that she and her extremely rich and handsome fiance are getting married in Totoko's face, but she even farts in Totoko's general direction before leaving just to add insult to injury.
  • Jerk with a Heart of Gold:
    • After spending most of her screentime being a Bitch in Sheep's Clothing, the season 2 finale features her attending the sextuplet's funeral despite, in her words, not knowing them very well.
    • She secretly has a baby, and works passionately in order to provide for it.
  • Jerk with a Heart of Jerk: When Totoko vents about how she's frustrated with being an idol and that she might quit, Nyaa offers to listen to her problems. After Totoko's (off-screen) explanation, Nyaa acts sympathetic towards her...only to use that as an opportunity to throw hot oden in Totoko's face as revenge for Totoko doing the same to her prior.
  • Idol Singer: A cat-themed one. While she's much more popular than Totoko, she admits that she still hasn't really made it big yet.
  • Love Makes You Crazy: During the episode "Just Don't", she basically accepts everything wrong about Osomatsu (including being late for date and trying to hug her despite not knowing who she is), just because he has saved her child from drowning a few days ago and she finds him cute afterwards.
  • Nice Character, Mean Actor: Her stage persona is very bubbly and cute, but "Totoko's Huge Panic" reveals that Nyaa herself is a pretty unpleasant person when her fans aren't around.
    • When Choromatsu pleads her not to pursue his trash eldest brother, she accuses him of addressing her as "Nyaa-chan" despite "having never known him before". This breaks Choromatsu's heart so much that he embarks a self-discovery world tour and has to overcome his PTSD towards cats for the rest of the episode.
  • Normal Fish in a Tiny Pond: While she's much more successful as an idol than Totoko is, this doesn't mean that she's actually successful as an idol in general. Season 3 reveals that she is struggling to make ends meet behind the scenes.
  • Passive Aggressive Combat: While she and Totoko mostly say polite things to each other, both of their inflections and expressions are dripping with contempt when they do. Since Season 2 the two interact much more frequently, and reveals that their squabbles often end in all-out fist fights, subverting this trope in the process.
  • Promotion to Opening Titles: Her treatment in the 2nd half of Season 1, with her featured in the opening despite not having much of a role in the show itself. She has further ascended through Season 2 and by early Season 3 she has become an actual recurring character.
  • The Rival: "Totoko's Huge Panic" suggests that she is one to Totoko. It's essentially confirmed in the second season, where Totoko is shown seething over how many more fans Nyaa has than her.
  • She's All Grown Up: The movie reveals that she was something of a Shrinking Violet when she was in middle school, whereas at present she's a charming and fashionable idol.
  • Smug Snake: Loves flaunting her success in Totoko's face in the first two seasons.
  • Straight Man: After she and Totoko becomes friends, the majority of the segments that feature them as a duo emphasize Nyaa's maturity and common sense compared to Totoko. This is notably inverted in the episode "Just Don't", where Nyaa is presented as the unreasonable one for refusing to listen to Totoko's very legitimate protestations about her crush on Osomatsu.
  • Struggling Single Mother: Episode 4 of Season 3 reveals that she and her husband have long since gotten divorced, and she now lives in a small apartment while working to provide for her baby.
  • Vitriolic Best Buds: She and Totoko become friends in Season 3, but they still frequently fight with each other.

    The Riceballs 
A pair of semi-identical robots that first appear in Season 3. They observe Akatsuka Ward (and in particular the cast) and make comments on what should and shouldn't be allowed in it. Named by Osomatsu as "Shake" and "Ume" (or "Salmon" and "Plum"), they are soon coined as the Riceballs for their facial features.

  • All of the Other Reindeer: The other robots/scientists look down on them as they can't help the Matsuno siblings.
  • Annoying Younger Sibling: Have this dynamic with the brothers. While they are said to be assist AI, they seem to mostly be picking up on the nature of the brothers and learning from them much like younger siblings might.
  • Boke and Tsukkomi Routine: Become one in-universe after developing wills of their own, with Shake as the boke and Ume as the tsukkomi.
  • Brutal Honesty: Engage in this when told to give their success rates to Totoko's career, quite honestly calling her success rate as an idol 'shit', only improving when she tries a Cat Girl gimmick instead of her usual fish one. Naturally, this hits her Berserk Button big time.
  • Catchphrase: "Are you happy? Are you satisfied?", which they often ask when doing their observations.
  • Cute Machines: Prove to be quite adorable in their attempts to help out and their understanding of the world.
  • The Dividual: Along with being nearly identical in appearance, they are indistinguishable in personality and often speak in unison. This becomes slightly less apparent after they undergo Divergent Character Evolution, but they remain very similar even afterwards.
  • Divergent Character Evolution: They each gain slightly more distinct personalities after becoming NEET AI, with Ume coming off as a bit of a Control Freak perfectionist and Shake being more laid-back and passive.
  • Edible Theme Naming: Since the brothers notice that their heads look like riceballs, they name the robots Shake and Ume ("Salmon" and "Plum"), which are ingredients commonly used in riceballs. They're also referred to as the Riceballs in general, which is lampshaded when they remark upon entering a comedy competition that they already have a team name.
  • Grew Beyond Their Programming: Accomplish this at the end of season 3's first cour. It turns them from Assist AI to NEET AI.
  • Hidden Depths: They show a fascination with the conventions of gag comedy early on during their time serving as the Matsuno's personal A.I.s, and decide to pursue a career in comedy almost immediately after they develop free wills of their own. They rise in the comedy world very quickly, and manage to compete in a national comedy grand prix within the first year of their career.
  • Identical Twin ID Tag: Shake wears an orange tie, while Ume wears a red tie.
  • Innocently Insensitive: Have no understanding of the world at large socially, so naturally no proper tact. This shows best in their interactions with Totoko and Iyami, driving one into a mad fury and the other into a full-on existential crisis thanks to their relentless questioning.
  • Second Episode Introduction: Introduced in the second episode of season 3 and become mainstays of the season.
  • Sensitive Guy and Manly Man: Ume is the more dominant and hard-working half of the duo whereas Shake is more laid-back and sensitive.
  • Tagalong Kid: Often accompany the Matsunos wherever they go.
  • Those Two Guys: The robots show up a lot in season 3 without one or the other by themselves.
  • Took a Level in Jerkass: Thanks to the influence of the Matsunos, they learn all the wrong things, becoming this by S3's second cour.
  • With Friends Like These...: Become this by season 3's second cour.

Recurring Characters

    Shonosuke Hijirisawa
Voiced by: Yoji Ueda

A strange man who keeps mysteriously showing up.

  • Bit Character: His entire purpose is to be a sentient punchline.
  • Darkhorse Victory: He of all people wins the race for the title of protagonist in "Iyami's Counterattack". Unfortunately, his new series proves to be so unpopular that it gets canceled before it manages to get through its opening scene.
  • God in Human Form: Season 2's finale Osomatsu-san in Hell reveals he's actually King Enma, who took on a human form to judge the sextuplets.
  • Massive Numbered Siblings: Taken Up to Eleven for "Shounosuke Hijirisawa-san", where the man has 17 younger brothers! And they're only younger by a small margin.
  • Mythology Gag: His appearance is based on that of a nameless one-off character from -Kun.
  • Named by the Adaptation: He never had a name in Osomatsu-kun until he got one during the Honest Axe parody.
  • Replacement Goldfish: At the end of "The Melancholy of Osomatsu", Osomatsu discovers that his brothers have become so fed up of his shenanigans that they’ve decided to replace him with Hijirisawa - who they now call "New Osomatsu-niisan". Needless to say, Osomatsu doesn’t take this well.
  • Recurring Extra: While he occasionally is given prominent parts in segments, he is more often than not nothing more than a walking visual gag.

     Aida & Sachiko
Voiced by: Aya Endo (Aida) and Momoko Saito (Sachiko) (Japanese), Cassandra Lee Morris (Aida) and Cherami Leigh (Sachiko) (English)

A pair of girls who frequently appear as either Todomatsu's acquaintances or the objects of the brothers' fleeting romantic interest. Aida is the one with curly hair and Sachiko is the one with the ponytail.

  • The Dividual: Besides their hair and voices, neither has any distinct traits from the other.
  • Failure Is the Only Option: Todomatsu will never be able to land a date with either of them despite almost always coming close, either due to his brothers' meddling or his own mistakes.
  • Muggle: The primary characters used to represent the "proper" world outside of the brothers' eccentric Closed Circle. They have no noteworthy personality quirks to speak of, are drawn in a blandly Puni Plush style compared to the main cast's more outlandish caricature-esque design, and seem to live perfectly ordinary lives. For these reasons, they are treated like divine beings by the Matsuno brothers.
  • Nice Girl: Both seem to generally be friendly, and put up with Todomatsu's brothers' awkwardness for a rather long time in "Todomatsu and the Five Demons". They have their limits, though, and are clearly put off by Karamatsu's behavior and the brothers' more outrageous antics.
  • Recurring Extra: Rarely ever do anything particularly notable, but appear frequently.
  • Satellite Character / Those Two Guys: They almost always appear together, and they rarely interact with characters other than Todomatsu. Aida has made two appearances without Sachiko, but remains a Satellite Character to Todomatsu during the first and serves as a Satellite Character to Atsushi (another character generally portrayed as a satellite to Todomatsu) in the second.

     Esper Kitten

A cat that receives the ability to speak and reveal a person's true thoughts.

  • Accessory-Wearing Cartoon Animal: He wears glasses, which nobody ever comments on.
  • Advertised Extra: He wasn't important enough to leave a lasting impression after his -Kun debut, but -San had the cat posted everywhere on merchandising, to the point where one would be justified in thinking that he was the Matsunos' Team Pet. Despite all this advertising, he only gets a few unimportant cameos after his role in episode 5.
  • Informed Attribute: Anan magazine had Ichimatsu refer to the cat as his "beloved pet", but the show just portrays it as a random stray.
  • Living Lie Detector: Which is why he becomes the ire of nearly everybody in Episode 5.
  • Telepathy: All versions of the cat could read the thoughts of people as they speak to it, and it repeats what they were thinking right afterwards.
  • Uplifted Animal: In his debut episode in -San, he gains the ability to speak thanks to Dekapan's new drug, though it's mentioned that the drug has long since worn off in "Jyuushimatsu Falls In Love".

    The Girly-Matsus
Voiced by: Takahiro Sakurai (Osoko), Yūichi Nakamura (Karako), Hiroshi Kamiya (Choroko), Jun Fukuyama (Ichiko), Daisuke Ono (Juushiko), Miyu Irino (Todoko)

A group of six friends who are set up to be distaff counterparts to the Matsuno sextuplets. Despite looking quite alike, they're not related to each other at all.

  • Aloof Dark-Haired Girl: Ichiko is about as straight of an example of one as you can possibly get.
  • Christmas Cake: All of them are implied to be in their mid-twenties, and they're each growing increasingly desperate to find a boyfriend. Apparently, they'll all continue to stay single well into old age.
  • Cool Big Sis: Osoko intentionally tries to invoke this image for herself at work. While she claims it's successful, it's yet to earn her a boyfriend.
  • Cool Loser: With the possible exception of Choroko, the Girly-matsus are much more socially well-adjusted and fashionable than the Matsuno brothers are, yet none of them appear to have any luck getting dates.
  • Crack Ship: Invoked. Choroko apparently ships Dayon and Chibita.
  • Dark-Skinned Blonde: Juushiko, due to being a Gyaru Girl.
  • Deadpan Snarker: Ichiko tends to sit back and haughtily snark on her friends as they fight with each other.
  • Demoted to Extra: Rather than get their own segments like in the first season, the Girlymatsus are reduced to being Recurring Extras who frequently appear in other segments with varying degrees of importance in the second.
  • Distaff Counterpart: While it was already common for fans to think of excuses to draw the Matsuno siblings as girls, the production decides to make strikingly similar looking female counterparts to the sextuplets care of episode 13. The end result is an entirely new set of characters whose appearances and interpersonal dynamics are totally different (to the point Word of God says they aren't even siblings), yet similar enough to the Matsuno brothers.
    • Osomatsu gets turned into Osoko, a brown-haired and Cool Big Sis-type Office Lady.
    • Karamatsu becomes Karako, a tanned and sporty gal with a perverted sense of humor.
    • Choromatsu becomes Choroko, who trades being an idol otaku for being a Meganekko Yaoi Fangirl.
    • Ichimatsu becomes Ichiko, a cool and mysterious Eerie Pale-Skinned Brunette.
    • Jyushimatsu becomes Juushiko, an airheaded ganguro.
    • Todomatsu becomes Todoko, who much like Todomatsu seems to be the most grounded of them all (but is evidently just as conniving).
  • Expy: Osoko's looks resemble the title character of Miss Machiko, another anime Pierrot adapted during the 80's.
  • The Fake Cutie: Todoko is the closest to her male counterpart overall in terms of personality, being someone who consciously tries to act both cuter and more innocent than they actually are.
  • Genki Girl: Juushiko isn't quite as crazy as Jyushimatsu, but she's just as energetic.
  • Heterosexual Life-Partners: Unlike the Matsuno brothers, they're not related at all. They're still just as codependent on each other.
  • Inexplicably Identical Individuals: They're not related to each other or the Matsunos at all, yet still look very similar.
  • The Lad-ette: Karako generally acts as macho and unfeminine as possible.
  • Larynx Dissonance: They are all one hundred percent woman. Not that you could tell from them being voiced by the regular Matsunos' voice actors.
  • Men Are Generic, Women Are Special: It is much easier to tell them apart than their male counterparts, with different hair colors and even different skin colors in the case of Karako and Juushiko. Justified because unlike their male counterparts, none of them are related.
  • Ms. Fanservice:
    • Juushiko tends to dress provocatively, though considering she both looks and sounds like Jyushimatsu in drag, her status as this might be debatable.
    • Karako also has traces of this, due to generally always wearing clothes that show off her ample bust. Like Juushiko, though, having the obviously male voice of Karamatu prevents her from definitively being one.
  • Odd Friendship: Unlike the Matsuno brothers, they have no blood relation to each other; they just happen to be six similar-looking strangers who, despite having completely disimilar personalities, are inseparable friends.
  • Only Sane Woman: In contrast to her male counterpart, Osoko is the most mature, rational and accomplished of the group, and generally the one who tries to keep the others from going completely nuts.
  • Recurring Extra: Seem to have become a group of these in season 2. Rather than have their own segments as they did in season 1, they instead make various appearances in other segments, with varying degrees of importance. In some, they simply appear in silent cameos. In others, such as "Jyushimatsu and Dolphins", they play actual characters within the story. Notably, even in spite of this change, each Girlymatsu has continued to never appear within the same segment as their respective male counterpart.
  • She Cleans Up Nicely: The rough and slovenly Karako looks stunning when she dresses up for a friend's wedding.
  • Tomboyish Ponytail: Karako usually has a ponytail, and she's the most athletic and least feminine of the group.
  • Vitriolic Best Buds: With all of their passive-aggressive banter and annoyances with each other, it's a wonder how they managed to stay friends (until old age no less, according to one skit) at all.
  • With Friends Like These...: They're just as dysfunctional as the Matsuno brothers, and also just as inseparable.
  • Women Are Wiser: While they're just as petty and unsuccessful with the opposite gender as their male counterparts, all six appear to live independently and support themselves, which automatically puts them above the sextuplets on the success ladder.
  • Yaoi Fangirl: Choroko can't look at two men together without shipping them.


Todomatsu's handsome, charming, and successful friend.

  • The Ace: He's good-looking, has a cool car and is smooth with women.
  • Always Someone Better: Completely outshines Todomatsu at the mixer they both attend in "Star of Hope Todomatsu".
  • Brick Joke: Todomatsu muses over the possibility of taking him to a mixer, only to dismiss the idea after realizing that he'd end up overshadowing him. At the end of the episode, after rejecting all of his brothers as possible companions, Todomatsu ends up bringing Atsushi to the mixer, where he ends up doing exactly what Todomatsu expected him to.
  • The Bus Came Back: Makes a surprise reappearance in the season 3 sketch "Nothing I Can Do Police".
  • Call-Back: Is briefly mentioned in "Osomatsu & Todomatsu" as having been responsible for setting up the group date that most of the episode takes place during.
  • Chick Magnet: All of the women at the mixer he and Todomatsu attend show interest in him.
  • Cool Car: Which Todomatsu views as one of the biggest edges he has over him.
  • Dreary Half-Lidded Eyes: He is drawn with half lidded eyes which reflects his charming and flirtatious personality.
  • Driven to Suicide: "Nothing I Can Do Police" begins with him attempting to jump off the side of a building from the stress caused by his job. The rest of the sketch centers around the onlookers attempting to talk him out of it.
  • Flanderization: Hesokuri Wars portrays him as being Todomatsu's nemesis who constantly swoops in to steal girls from him at the last second. In the series itself, there's no suggestion that he does this frequently and he's actually noted to have helped Todomatsu line up a date for himself in "Osomatsu & Todomatsu".
  • Flat Character: He mostly exists to serve as a Brick Joke punchline at the end of "Star of Hope Todomatsu", though he receives some additional screentime and depth in the "Nothing I Can Do Police" segment.
  • Foil: To Todomatsu. He's essentially everything Todomatsu pretends to be, and is significantly more popular and successful than he is as a result. "Nothing I Can Do Police" also reveals that he feels completely isolated from everybody at his job in spite of his popularity, whereas Todomatsu, due to being from a set of sextuplets, is almost always surrounded by people he can relate to both inside and out.
  • Hidden Depths: "Nothing I Can Do Police" reveals that he suffers from social pressures of his own, mostly feeling as though he is completely alone despite his surface popularity.
  • Inexplicably Identical Individuals: He could pass off as one of the sextuplets barring a few minor differences.
  • Informed Attractiveness: He's apparently pretty handsome, but he doesn't look terribly different from the seemingly average-looking Matsuno brothers.
  • Lonely Among People: While he's charming and popular, "Nothing I Can Do Police" reveals that he feels so alone at his workplace that it nearly causes him to commit suicide.
  • Not So Above It All: While his first appearance frames him as a simple "perfect guy" strawman to contrast the sextuplets, "Nothing I Can Do Police" features him attempting suicide due to feeling isolated at work.
  • Satellite Character: He's Todomatsu's handsome friend who owns a nice car and... not much else. Notably, his appearance in "Nothing I Can Do Police", which grants him some Hidden Depths, doesn't feature Todomatsu in any capacity.
  • Sharp-Dressed Man: Wears a smart-looking suit.

Voiced by: Daisuke Ono
A miserable middle-aged office worker who shows up at least once a season.
  • Art Shift: The characters that appear in his segments, himself included, are more realistically designed than the show's usual cast and have a much more subdued color pallet.
  • Cyborg: Season 3 brings him back as "Sanecop", a RoboCop-esque existence that was revived after his death in Season 2.
  • Dull Eyes of Unhappiness: He possesses the same large eyes and flat black pupils as the Matsuno brothers do, but they serve to make him look depressed and mentally unwell rather than cartoonish.
  • Genre Shift: His segments are always a departure from the show's usual gag-based formula, with his first appearance evoking a daytime drama, his second being close to a psychological thriller, and his third being an all-out RoboCop parody.
  • Gonk: He looks like one of the Matsuno brothers drawn as a realistic middle-aged salary man. Certain features that look cartoonish on the brothers, such as their large, beady eyes end up looking downright unsettling on him.
  • Knight of Cerebus: Segments starring him tend to be either depressing or creepy.
  • Loners Are Freaks: Sanematsu has been so lonely for so long that he's begun to hallucinate a life with five other brothers.
  • Salaryman: While he is based off of the Matsuno brothers and is just as much as a loser as them, Sanematsu actually has a job—but unfortunately he's a middle management pencil pusher in an office building.

Voiced by: Yumiko Kobayashi
A young boy who Jyushimatsu befriends in "The Eitarou Family". He steadily grows to idolize Jyushimatsu, which causes his mother to worry about him.
  • Cat Smile: Possesses a small cat-like smirk at all times.
  • Cheerful Child: He's able to keep up with Jyushimatsu in terms of energy and optimism.
  • Hero-Worshipper: Comes to view Jyushimatsu as the epitome of cool, and seeks to emulate him in every way.
  • Intergenerational Friendship: Though it's not exactly surprising considering that Jyushimatsu is a hardcore Manchild.
  • Pint-Sized Kid: He's positively tiny.
  • Sincerest Form of Flattery: Attempts to emulate Jyushimatsu in every way after befriending him, to the point of wearing the same clothes.
  • Surpassed the Teacher: At the end of "The Eitarou Family", Eitarou takes Jyushimatsu's advice on how to make friends and manages to succeed with outstanding results. Jyushimatsu is very proud of his student, until Eitarou reveals that he also got a girlfriend. Jyushimatsu literally expels the poor boy and his girlfriend miles into the air, in plain sight of his long-suffering mother.
  • Troubled Child: According to his mother, he hasn't been able to make many friends due to their family moving around a lot for his father's job.

    The Ugly Flower Fairy 
Voiced by: Kimiko Saito
First appearing in Season 1 episode 15 as Karamatsu's experiment Gone Horribly Wrong, she takes up new roles in subsequent appearances.
  • Be Careful What You Wish For: Karamatsu's attempt at replicating Chibita's own Magical Girlfriend ends up getting him an ugly, borderline abusive nag of a romantic partner.
  • Gonk: If her name didn't clue you in, she's very ugly.
  • Hidden Depths: She helps Nyaa Hashimoto by looking after her baby when she's working, and generally seems far more understanding than she did in her debut appearance.
  • Horrible Judge of Character: She's occasionally depicted as living with Iyami and is the only character that supports Nyaa's crush on Osomatsu. Justified in that she was created by Karamatsu.
  • Recurring Extra: After her first appearance, she generally only appears as a background character. Season 3 brings her back into limited prominence and gives her a more consistent role as Nyaa's nanny.
  • Sudden Name Change: In the 'Wannabe Detectives' sketch, she was given the name 'Dobuko Busujima'.
  • Took a Level in Kindness: Was an abusive and controlling monster in her debut episode. In Season 3, however, she's an understanding friend of Nyaa's who looks after her baby when she's busy.
  • Wet Blanket Wife: Functions as this to Karamatsu during her first appearance. In subsequent appearances, she is occasionally depicted as being this to Iyami.

One-shot Characters

    The Country Girl
Voiced by: Houko Kuwashima

A young woman that Jyushimatsu befriends after she saves him from drowning. The two of them start seeing each other for a month.

  • The Bus Came Back: She leaves town at the end of her debut episode but is still part of the Continuity Cavalcade in the second cour finale, attending Coachmatsu's funeral and later showing up in a baseball uniform with "Jyushi" written on it. She makes a proper reappearance in the segment "Jyushimatsu and the Dolphins", though it's unclear if the events that occur during it are set in the same continuity as in her first appearance.
  • Cloud Cuckoolander: A somewhat subtle example, but the fact that she finds all of Jyushimatsu's bizarre antics incredibly amusing firmly places her here. "Jyushimatsu and the Dolphins" has her wholeheartedly support Jyushimatsu's efforts to become a dolphin, further proving her status as one.
  • Cry Laughing: Zigzagged when she's leaving Jyushimatsu on the train. When he first does his trick again, she's crying very hard. But before she disappears out of his sight, her tears have turned into laughs once more. And then, as she gets farther away from him, she's crying again.
  • Driven to Suicide: The first time she encountered Jyushimatsu, she was getting ready to throw herself off a cliff and into the ocean. Jyushimatsu notes that his unexpected presence at the beach unintentionally interrupted her.
  • Mysterious Past: Her debut episode never explicitly mentions why she was suicidal, though it's implied that she used to be in the porn industry and was seeking a way out.
  • No Name Given: The credits listed her as "Kanojo"/"Her"/"Girlfriend", but as far as names go that's pretty much it.
  • Official Couple: Despite all signs pointing to a relationship between her and Jyushimatsu, it doesn't work out. Jyushimatsu confesses that he loves her and she admits that she loves him back, but they're unable to pursue a relationship because she has to move back to the countryside after the month is over.
  • Satellite Character: Both of her major appearances revolve around her interactions with Jyushimatsu.
  • Training from Hell: When training Jyushimatsu to become a dolphin, she pulls no punches and immediately subjects him to exercises that are literally impossible for anything other than a dolphin to perform.
  • Youthful Freckles: Sports a light set of them, giving her a cute Girl Next Door-style appearance.

    The Flower Girl 
Voiced by: Yuu Wakui
A young flower sprite that decides to hang out with Chibita because he watered the flower she sprouted from.
  • Back from the Dead: She makes a cameo in the final episode as a member of the brothers' baseball team, only to be killed by aliens along with everyone else.
  • Because You Were Nice to Me: Because Chibita took pity of the girl's wilting flower, she offers to stay with him and cook for him, or just to give him some much needed companionship.
  • Disappears into Light: Her final fate after hanging around with Chibita.
  • Eerie Pale-Skinned Brunette: How she appears in this take on the story.
  • Manic Pixie Dream Girl: In -San, she becomes this for Chibita to get him to stop focusing on oden.
  • Mythology Gag: She and her story were taken from an older -Kun chapter with a similiar premise.

Voiced by: Kenji Nojima (Japanese), Johnny Yong Bosch (English)
The essential goodness of the sextuplets that's been gradually collected over the course of -San before manifesting in physical form.
  • The Ace: Much better at everything than the Matsunos are.
  • Bishounen: Unlike the Beady-Eyed Loser Matsu brothers, Godmatsu has comically large and passionate-looking pupils. Despite looking otherwise identical to the other six, he is considered to be much more attractive by Totoko.
  • Color-Coded Characters: White.
  • Enemy Without: A good version, and only because the sextuplets are such awful people.
  • Gold and White Are Divine: A manifestation pure goodness who wears white and has gold eyes.
  • The Heartless: A variant; he was created when the goodness of the Matsunos was pushed out by their shittiness.
  • Innocently Insensitive: As an embodiment of goodness, he is simply trying to improve the lives of the people around him however he can. His perfection only serves to make the sextuplets feel inadequate and filled with jealous rage.
  • Light Is Good: Frequently depicted with light shining upon/from himself.
  • Made of Good: He somehow formed from the accumulated bits of goodwill that fell off the Matsunos whenever they did something cruel or crappy.
  • Nice Guy: Almost frustratingly kindhearted and self-sacrificing.
  • Parody Sue: He's talented, considerate, and able to accomplish more in five days than any of the regular Matsus have in their entire lives. Naturally, they quickly grow to resent him.
  • Physical God: Somewhat. While he doesn't display the same level of outright godly power that Evilmatsu does, he's shown to be supernaturally good at everything.
  • Supernatural Gold Eyes: His eyes are large and gold to emphasize his pseudo-deity status.
  • Token Good Teammate: Due to being the physical embodiment of the brothers' goodness, he naturally played this role during his very short stint as the seventh brother.
  • Too Good for This Sinful Earth: Or at least too good to live among the Matsuno brothers.
  • Ultimate Life Form: Described as the purest and most perfect Matsu. See Parody Sue.
  • Unusual Ears: His droopy earlobes bring to mind the Buddha as a means of further conveying his saintliness.

Voiced by: Tomokazu Sugita (Japanese), Patrick Seitz (English)
The collected darkness and malice of the Matsuno siblings, which manifests over their frustration and jealousy of Godmatsu finally hitting a breaking point.
  • Did We Just Have Tea with Cthulhu?: Despite being Made of Evil, he considers the sexuplets his siblings and allows himself to be reabsorbed into their bodies once Godmatsu is defeated, even adding that they're free to summon him whenever they want.
  • Eldritch Abomination: Unlike Godmatsu, who is mostly identical to the brothers, Evilmatsu is a formless mass of black energy.
  • Enemy Without: Subverted. While he's the embodiment of the brothers' darkness, they actually get along well with him since they're naturally shitty people and the obnoxiously perfect Godmatsu was pissing them off.
  • Evil Counterpart: To Godmatsu, due to being the embodiment of the brothers' evil to his good.
  • Evil Sounds Deep: Speaks with a booming, ominous voice.
  • The Heartless: Made of the jealousy the Matsunos built up towards Kamimatsu.
  • Made of Evil: He's the embodiment of the group's "shittiness", and is thus much larger than Godmatsu.
  • Physical God: Much more overtly supernatural than Godmatsu is, and seems to affect the atmosphere when he appears.
  • Red Eyes, Take Warning: One of his only discernible features besides his mouth.
  • Slasher Smile: One of his only discernible features besides his eyes.
  • Villainous Rescue: Delivers a Curb-Stomp Battle to Godmatsu.

The Matsuno's baseball coach and mentor.
  • Badass Armfold: Exclusively seen in this pose throughout his very limited screentime.
  • Cool Shades: Sports a pair.
  • Family Theme Naming: Has the "-matsu" at the end of his name like the brothers do, possibly to showcase just how close they were with him.
  • Informed Ability: He was apparently an amazing guy who is mourned extensively by the entire cast after his death, but the audience only sees him silently nodding in approval a few times before he is killed off.
  • Last Episode, New Character: Appears out of nowhere in the last episode. Especially egregious as, even after appearing, the audience isn't informed of who he is until after he dies offscreen.
  • Killed Offscreen: Dies sometime during the brothers' Training Montage.
  • Mentor Occupational Hazard: Dies after the brothers lose their invitational, completely offscreen.
  • Remember the New Guy?: Invoked by just about everyone but Choromatsu and Matsuzou. Clips of old episodes were edited to make it look like he was there the whole time training the brothers.
  • The Stoic: His features are obscured by his shades and facial hair, making his expression appear unchanging.
  • The Voiceless: Never utters a word during the small window of time where he's seen alive.
  • We Hardly Knew Ye: More like "We Didn't Even Know Who Ye Were Until After Ye Died".

     Kinko Inuyama
Voiced by: Kanae Ito
A cute tomboyish girl who moves next door to and befriends the Matsunos in "The Cutie next Door", earning Totoko's jealousy.
  • Affectionate Nickname: She invites the Matsuno brothers to call her "Kin-chan", which they're all too happy to do since she's a cute girl.
  • Ambiguously Brown: She's notably tan.
  • Boyish Short Hair: Sports a short bob that quickly clues the audience into her status as a Tomboy.
  • Cute Clumsy Girl: The brothers first start talking to her after she accidentally lets one of her bras fly into their yard, and their friendship grows after she continues to do so over and over again.
  • Foil: To Totoko. While Totoko is the Fake Cutie who only acts kindly towards the brothers when she wants to use them for something, Kinko is open and honest with them from day one, which quickly causes them to gravitate away from Totoko towards her.
  • Good Is Not Soft: She doesn't mince words about the Matsunos being sketchy perverts, but is still willing to befriend them without any kind of catch.
  • Nice Girl: One of the rare characters to befriend the brothers without any ulterior motives.
  • Odd Friendship: With the Matsunos. She's cute, friendly and outgoing while the six of them are all to varying degrees shifty, socially-awkward scumbags. Despite this, their friendship is completely genuine and very sweet.
  • Tomboy and Girly Girl: The tomboy to Totoko's girly girl.

A blind little flower girl who Iyami helps in "Iyami, Alone in the Wind".